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Taylor AB, Terhune CE, Ross CF, Vinyard CJ. The impact of measurement technique and sampling on estimates of skeletal muscle fibre architecture. Anat Rec (Hoboken) 2024; 307:3071-3084. [PMID: 38406878 DOI: 10.1002/ar.25415] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2023] [Revised: 02/12/2024] [Accepted: 02/12/2024] [Indexed: 02/27/2024]
Abstract
Skeletal muscle fibre architecture provides important insights into performance of vertebrate locomotor and feeding behaviours. Chemical digestion and in situ sectioning of muscle bellies along their lengths to expose fibres, fibre orientation and intramuscular tendon, are two classical methods for estimating architectural variables such as fibre length (Lf) and physiological cross-sectional area (PCSA). It has recently been proposed that Lf estimates are systematically shorter and hence less accurate using in situ sectioning. Here we addressed this hypothesis by comparing Lf estimates between the two methods for the superficial masseter and temporalis muscles in a sample of strepsirrhine and platyrrhine primates. Means or single-specimen Lf estimates using chemical digestion were greater in 17/32 comparisons (53.13%), indicating the probability of achieving longer fibres using chemical digestion is no greater than chance in these taxonomic samples. We further explored the impact of sampling on scaling of Lf and PCSA in platyrrhines applying a bootstrapping approach. We found that sampling-both numbers of individuals within species and representation of species across the clade significantly influence scaling results of Lf and PCSA in platyrrhines. We show that intraspecific and clade sampling strategies can account for differences between previously published platyrrhine scaling studies. We suggest that differences in these two methodological approaches to assessing muscle architecture are relatively less consequential when estimating Lf and PCSA for comparative studies, whereas achieving more reliable estimates within species through larger samples and representation of the full clade space are important considerations in comparative studies of fibre architecture and scaling.
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Affiliation(s)
- Andrea B Taylor
- Department of Foundational Biomedical Sciences, Touro University California, Vallejo, California, USA
| | - Claire E Terhune
- Department of Anthropology, University of Arkansas, Fayetteville, Arkansas, USA
| | - Callum F Ross
- Department of Organismal Biology and Anatomy, The University of Chicago, Chicago, Illinois, USA
| | - Christopher J Vinyard
- Biomedical Sciences, Ohio University-Heritage College of Osteopathic, Medicine, Athens, Ohio, USA
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2
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Polvadore TA, Yoakum CB, Taylor PM, Holmes MA, Laird MF, Chalk-Wilayto J, Kanno CM, de Oliveira JA, Terhune CE. Ontogenetic biomechanics of tufted (Sapajus) and untufted (Cebus) capuchin mandibles. AMERICAN JOURNAL OF BIOLOGICAL ANTHROPOLOGY 2024:e25006. [PMID: 39049552 DOI: 10.1002/ajpa.25006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/11/2024] [Revised: 07/02/2024] [Accepted: 07/09/2024] [Indexed: 07/27/2024]
Abstract
OBJECTIVES Cortical bone geometry is commonly used to investigate biomechanical properties of primate mandibles. However, the ontogeny of these properties is less understood. Here we investigate changes in cortical bone cross-sectional properties throughout capuchin ontogeny and compare captive versus wild, semi-provisioned groups. Tufted capuchins (Sapajus spp.) are known to consume relatively hard/tough foods, while untufted capuchins (Cebus spp.) exploit less mechanically challenging foods. Previous research indicates dietary differences are present early in development and adult Sapajus mandibles can resist higher bending/shear/torsional loads. MATERIALS AND METHODS This study utilized microCT scans of 22 Cebus and 45 Sapajus from early infancy to adulthood from three sample populations: one captive Cebus, one captive Sapajus, and one semi-provisioned, free-ranging Sapajus. Mandibular cross-sectional properties were calculated at the symphysis, P3, and M1. If the tooth had not erupted, its position within the crypt was used. A series of one-way ANOVAs were performed to assess differences between and within the sample populations. RESULTS Mandible robusticity increases across ontogeny for all three sample populations. Sapajus were better able to withstand bending and torsional loading even early in ontogeny, but no difference in shear resistance was found. Semi-provisioned, free-ranging Sapajus tend to show increased abilities to resist bending and torsional loading but not shear loading compared to captive Sapajus. DISCUSSION This study helps advance our understanding of the primate masticatory system development and opens the door for further studies into adaptive plasticity in shaping the masticatory apparatus of capuchins and differences in captive versus free-ranging sample populations.
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Affiliation(s)
- Taylor A Polvadore
- Department of Anthropology, University of Arkansas, Fayetteville, Arkansas, United States
| | - Caitlin B Yoakum
- Department of Anatomy, Arkansas College of Osteopathic Medicine, Arkansas Colleges of Health Education, Fort Smith, Arkansas, United States
| | - Parker M Taylor
- Department of Anthropology, University of Arkansas, Fayetteville, Arkansas, United States
| | - Megan A Holmes
- Department of Family Medicine and Community Health, Duke University School of Medicine, Durham, North Carolina, United States
| | - Myra F Laird
- Department of Basic and Translational Sciences, University of Pennsylvania, Philadelphia, Pennsylvania, United States
| | - Janine Chalk-Wilayto
- Department of Biomedical Sciences, Mercer University School of Medicine, Macon, Georgia, United States
| | - Cláudia Misue Kanno
- Research Center "Núcleo de Procriação de Macacos-Prego", Araçatuba Dental School, Universidade Estadual Paulista-UNESP, Araçatuba, Brazil
| | - José Américo de Oliveira
- Research Center "Núcleo de Procriação de Macacos-Prego", Araçatuba Dental School, Universidade Estadual Paulista-UNESP, Araçatuba, Brazil
| | - Claire E Terhune
- Department of Anthropology, University of Arkansas, Fayetteville, Arkansas, United States
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3
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Deane AS, Muchlinski MN, Organ JM, Vereecke E, Bistrekova V, Hays L, Butterfield T. The comparative and functional anatomy of the forelimb muscle architecture of Humboldt's woolly monkey (Lagothrix lagotricha). Anat Rec (Hoboken) 2024. [PMID: 38938152 DOI: 10.1002/ar.25514] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2023] [Revised: 05/13/2024] [Accepted: 05/15/2024] [Indexed: 06/29/2024]
Abstract
Humboldt's woolly monkey (Lagothrix lagortricha) is a ceboid primate that more frequently engages in plantigrade quadrupedalism (~89%) but is, like most other members of the subfamily Atelinae, capable of suspensory postures and "tail assisted" brachiation. That taxon's decreased reliance on suspension is reflected in the skeletal anatomy of the upper limb which is less derived relative to more frequently suspensory atelines (Ateles, Brachyteles) but is in many ways (i.e., phalangeal curvature, enlarged joint surfaces, elongated diaphyses) intermediate between highly suspensory and quadrupedal anthropoids. Although it has been suggested that muscle may have morphogenetic primacy with respect to bone this has not been explicitly tested. The present study employs analyses of Lagothrix upper limb muscle fiber length, relative physiological cross-sectional area and relative muscle mass to test whether muscular adaptations for suspensory postures and locomotion in Lagothrix precede adaptive refinements in the skeletal tissues or appear more gradually in conjunction with related skeletal adaptations. Results demonstrate that Lagothrix upper limb musculature is most like committed quadrupeds but that limited aspects of the relative distribution of segmental muscle mass may approach suspensory hylobatids consistent with only a limited adaptive response in musculature prior to bone. Results specific to the shoulder were inconclusive owing to under-representation of quadrupedal shoulder musculature and future work should be focused more specifically on the adaptive and functional morphology of the muscular anatomy and microstructure of the scapulothoracic joint complex.
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Affiliation(s)
- Andrew S Deane
- Department of Anatomy, Cell Biology & Physiology, Indiana University School of Medicine, Indianapolis, Indiana, USA
- Department of Anthropology, Indiana University Indianapolis, Indianapolis, Indiana, USA
- Centre for the Exploration of the Deep Human Journey, University of Witwatersrand, Johannesburg, South Africa
| | | | - Jason M Organ
- Department of Anatomy, Cell Biology & Physiology, Indiana University School of Medicine, Indianapolis, Indiana, USA
- Department of Anthropology, Indiana University Indianapolis, Indianapolis, Indiana, USA
| | - Evie Vereecke
- Department of Development and Regeneration, KU Leuven, Leuven, Belgium
| | - Vanya Bistrekova
- ICTA, Department of Environmental Science and Technology, Universitat Autònoma de Barcelona, Barcelona, Spain
| | - Lindsey Hays
- Department of Neuroscience, University of Kentucky College of Medicine, Lexington, Kentucky, USA
| | - Timothy Butterfield
- Department of Rehabilitation Science, University of Kentucky College of Health Sciences, Lexington, Kentucky, USA
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4
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Dickinson E, Manzo M, Davis CE, Kolli S, Schwenk A, Carter A, Liu C, Vasipalli N, Ratkiewicz A, Deutsch AR, Granatosky MC, Hartstone-Rose A. Ecological correlates of three-dimensional muscle architecture within the dietarily diverse Strepsirrhini. Anat Rec (Hoboken) 2024; 307:1975-1994. [PMID: 38063131 DOI: 10.1002/ar.25361] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2023] [Revised: 10/27/2023] [Accepted: 11/22/2023] [Indexed: 05/08/2024]
Abstract
Analysis of muscle architecture, traditionally conducted via gross dissection, has been used to evaluate adaptive relationships between anatomical form and behavioral function. However, gross dissection cannot preserve three-dimensional relationships between myological structures for analysis. To analyze such data, we employ diffusible, iodine-based contrast-enhanced computed tomography (DiceCT) to explore the relationships between feeding ecology and masticatory muscle microanatomy in eight dietarily diverse strepsirrhines: allowing, for the first time, preservation of three-dimensional fascicle orientation and tortuosity across a functional comparative sample. We find that fascicle properties derived from these digital analyses generally agree with those measured from gross-dissected conspecifics. Physiological cross-sectional area was greatest in species with mechanically challenging diets. Frugivorous taxa and the wood-gouging species all exhibit long jaw adductor fascicles, while more folivorous species show the shortest relative jaw adductor fascicle lengths. Fascicle orientation in the parasagittal plane also seems to have a clear dietary association: most folivorous taxa have masseter and temporalis muscle vectors that intersect acutely while these vectors intersect obliquely in more frugivorous species. Finally, we observed notably greater magnitudes of fascicle tortuosity, as well as greater interspecific variation in tortuosity, within the jaw adductor musculature than in the jaw abductors. While the use of a single specimen per species precludes analysis of intraspecific variation, our data highlight the diversity of microanatomical variation that exists within the strepsirrhine feeding system and suggest that muscle architectural configurations are evolutionarily labile in response to dietary ecology-an observation to be explored across larger samples in the future.
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Affiliation(s)
- Edwin Dickinson
- Department of Biological Sciences, North Carolina State University, Raleigh, North Carolina, USA
- Department of Anatomy, College of Osteopathic Medicine, New York Institute of Technology, Old Westbury, New York, USA
| | - Madison Manzo
- Department of Biological Sciences, North Carolina State University, Raleigh, North Carolina, USA
| | - Cassidy E Davis
- Department of Biological Sciences, North Carolina State University, Raleigh, North Carolina, USA
| | - Shruti Kolli
- Department of Biological Sciences, North Carolina State University, Raleigh, North Carolina, USA
- Department of Biological Sciences, University of Denver, Denver, Colorado, USA
| | - Alysa Schwenk
- Department of Biological Sciences, North Carolina State University, Raleigh, North Carolina, USA
- College of Public Health, Thomacharles Jefferson University, Philadelphia, Pennsylvania, USA
| | - Ashley Carter
- Department of Biological Sciences, North Carolina State University, Raleigh, North Carolina, USA
| | - Cindy Liu
- Department of Biological Sciences, North Carolina State University, Raleigh, North Carolina, USA
| | - Nimi Vasipalli
- Department of Biological Sciences, North Carolina State University, Raleigh, North Carolina, USA
| | - Aleksandra Ratkiewicz
- Department of Anatomy, College of Osteopathic Medicine, New York Institute of Technology, Old Westbury, New York, USA
| | - Ashley R Deutsch
- Department of Biological Sciences, North Carolina State University, Raleigh, North Carolina, USA
| | - Michael C Granatosky
- Department of Anatomy, College of Osteopathic Medicine, New York Institute of Technology, Old Westbury, New York, USA
- Center for Biomedical Innovation, College of Osteopathic Medicine, New York Institute of Technology, Old Westbury, New York, USA
| | - Adam Hartstone-Rose
- Department of Biological Sciences, North Carolina State University, Raleigh, North Carolina, USA
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5
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Edmonds HM, Daly ES, Smail IE. Zygomatic arch root position in relation to dietary type in haplorhine primates. Anat Rec (Hoboken) 2024; 307:2065-2083. [PMID: 37877628 DOI: 10.1002/ar.25340] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2023] [Revised: 10/08/2023] [Accepted: 10/09/2023] [Indexed: 10/26/2023]
Abstract
The zygomatic root, along with other key craniofacial features, is hypothesized to play a crucial role in strengthening the face in response to stresses and strains related to feeding. As such, it has been cited as indicative of dietary specialization among fossil taxa, although it remains unknown how variable zygomatic arch root position is among living primates, and whether its positioning predicts differences in diet. We test whether primates that consume more mechanically challenging foods possess more anteriorly positioned zygomatic roots compared to those consuming less challenging foods. Zygomatic root position, as defined by the zygomaxillare landmark, was identified and recorded from digital images and physical specimens of adult primate crania. Data were collected from 33 haplorhine species (n = 722). Published data were used to assign species to a dietary type based on patterns of overall consumption along with reliance on especially challenging foods. Pairwise comparisons between mechanically challenging (hard and/or tough) and less mechanically challenging (soft) consumers found significant differences (p < 0.05) in the position of the zygomatic root in 17 of 20 pairs, 11 of which supported the prediction that a more mechanically challenging diet is associated with a more anteriorly placed zygomatic root. PGLS analysis found no significant effect of phylogeny on root position. This suggests that a more anteriorly positioned zygomatic root is useful for identifying dietary specialization in some taxa but is not required for consuming a mechanically challenging diet given that other craniofacial and behavioral factors can facilitate the consumption of such foods.
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Affiliation(s)
- Hallie M Edmonds
- Department of Social and Behavioral Sciences, Chandler-Gilbert Community College, Chandler, Arizona, USA
| | - E Susanne Daly
- Department of Biological Sciences, Salisbury University, Salisbury, Maryland, USA
| | - Irene E Smail
- Department of Biomedical Sciences, West Virginia School of Osteopathic Medicine, Lewisburg, West Virginia, USA
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6
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Yamashita N, Flowers N, Fogaça MD. The effects of feeding frequency on jaw loading in two lemur species. AMERICAN JOURNAL OF BIOLOGICAL ANTHROPOLOGY 2024; 184:e24916. [PMID: 38441408 DOI: 10.1002/ajpa.24916] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/09/2023] [Revised: 02/03/2024] [Accepted: 02/09/2024] [Indexed: 04/12/2024]
Abstract
OBJECTIVES Studies on oral processing are often snapshots of behaviors that examine feeding through individual bouts. In this study, we expand on our previous work comparing bite/chew variables per feeding bout to summed daily biting, chewing, and food intake to interpret loading that could have potential morphological effects. MATERIALS AND METHODS We observed sympatric Lemur catta and Propithecus verreauxi over two field seasons in the dry forest of Bezà Mahafaly Special Reserve in southwestern Madagascar. Bite and chew rates determined from videos filmed during observations were multiplied with time spent feeding on specific foods during focal follows to calculate daily values for each feeding bout. Food mechanical properties (FMPs) were tested on dietary items with a portable tester. We contrasted daily bite/chew numbers and intake with FMPs, species, season, and food shape. RESULTS Daily bite and chew numbers increased with maximum, but not average, food toughness. Daily intake decreased with average and maximum toughness. Season had a strong effect on daily bites and chews, but not on intake. Food shape influenced intake and total bite and chew numbers. The lemur species did not differ in our models. DISCUSSION Maximum food toughness impacted feeding behaviors and intake, which is consistent with higher loads having a greater effect on morphology. In contrast to feeding per bout, cumulative biting and chewing did not differ between species; taking feeding frequency into consideration affects interpretation of jaw loading. Finally, biting, as much as chewing, may generate strains that impact morphology.
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Affiliation(s)
- Nayuta Yamashita
- Institute of Population Genetics, University of Veterinary Medicine, Vienna, Austria
- Austrian Academy of Sciences, Vienna, Austria
| | - Nina Flowers
- Institute of Population Genetics, University of Veterinary Medicine, Vienna, Austria
| | - Mariana Dutra Fogaça
- Institute of Population Genetics, University of Veterinary Medicine, Vienna, Austria
- Neotropical Primates Research Group-NeoPRego, São Paulo, Brazil
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7
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Holmes MA, Terhune CE, Chalk-Wilayto J, Yoakum CB, Taylor P, Ramirez R, Solís MP, Polvadore TA, Ross CF, Taylor AB, Fogaca MD, Laird MF. Ontogenetic changes in jaw leverage and skull shape in tufted and untufted capuchins. J Morphol 2024; 285:e21705. [PMID: 38704727 DOI: 10.1002/jmor.21705] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2024] [Revised: 04/19/2024] [Accepted: 04/24/2024] [Indexed: 05/07/2024]
Abstract
The ontogeny of feeding is characterized by shifting functional demands concurrent with changes in craniofacial anatomy; relationships between these factors will look different in primates with disparate feeding behaviors during development. This study examines the ontogeny of skull morphology and jaw leverage in tufted (Sapajus) and untufted (Cebus) capuchin monkeys. Unlike Cebus, Sapajus have a mechanically challenging diet and behavioral observations of juvenile Sapajus suggest these foods are exploited early in development. Landmarks were placed on three-dimensional surface models of an ontogenetic series of Sapajus and Cebus skulls (n = 53) and used to generate shape data and jaw-leverage estimates across the tooth row for three jaw-closing muscles (temporalis, masseter, medial pterygoid) as well as a weighted combined estimate. Using geometric morphometric methods, we found that skull shape diverges early and shape is significantly different between Sapajus and Cebus throughout ontogeny. Additionally, jaw leverage varies with age and position on the tooth row and is greater in Sapajus compared to Cebus when calculated at the permanent dentition. We used two-block partial least squares analyses to identify covariance between skull shape and each of our jaw muscle leverage estimates. Sapajus, but not Cebus, has significant covariance between all leverage estimates at the anterior dentition. Our findings show that Sapajus and Cebus exhibit distinct craniofacial morphologies early in ontogeny and strong covariance between leverage estimates and craniofacial shape in Sapajus. These results are consistent with prior behavioral and comparative work suggesting these differences are a function of selection for exploiting mechanically challenging foods in Sapajus, and further emphasize that these differences appear quite early in ontogeny. This research builds on prior work that has highlighted the importance of understanding ontogeny for interpreting adult morphology.
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Affiliation(s)
- Megan A Holmes
- Department of Family Medicine and Community Health, Duke University School of Medicine, Durham, North Carolina, USA
| | - Claire E Terhune
- Department of Anthropology, University of Arkansas, Fayetteville, North Carolina, USA
| | - Janine Chalk-Wilayto
- Department of Biomedical Sciences, Mercer University School of Medicine, Savannah, Georgia, USA
| | - Caitlin B Yoakum
- Department of Anatomy, Arkansas College of Health Education, Fort Smith, Arkansas, USA
| | - Parker Taylor
- Department of Anthropology, University of Arkansas, Fayetteville, North Carolina, USA
| | - Rocio Ramirez
- Department of Integrative Anatomical Sciences, University of Southern California, Los Angeles, California, USA
| | - Megan P Solís
- Department of Anthropology, Stony Brook University, Stony Brook, New York, USA
| | - Taylor A Polvadore
- Department of Anthropology, University of Arkansas, Fayetteville, North Carolina, USA
| | - Callum F Ross
- Department of Organismal Biology and Anatomy, University of Chicago, Chicago, Illinois, USA
| | - Andrea B Taylor
- Department of Foundational Biomedical Sciences, Touro University California, Vallejo, California, USA
| | | | - Myra F Laird
- Department of Basic and Translational Sciences, University of Pennsylvania, Philadelphia, Pennsylvania, USA
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8
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Laird MF, Iriarte-Diaz J, Byron CD, Granatosky MC, Taylor AB, Ross CF. Gape drives regional variation in temporalis architectural dynamics in tufted capuchins. Philos Trans R Soc Lond B Biol Sci 2023; 378:20220550. [PMID: 37839440 PMCID: PMC10577035 DOI: 10.1098/rstb.2022.0550] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2023] [Accepted: 06/10/2023] [Indexed: 10/17/2023] Open
Abstract
Dynamic changes in jaw movements and bite forces depend on muscle architectural and neural factors that have rarely been compared within the same muscle. Here we investigate how regional muscle architecture dynamics-fascicle rotation, shortening, lengthening and architectural gear ratio (AGR)-vary during chewing across a functionally heterogeneous muscle. We evaluate whether timing in architecture dynamics relates to gape, food material properties and/or muscle activation. We also examine whether static estimates of temporalis fibre architecture track variation in dynamic architecture. Fascicle-level architecture dynamics were measured in three regions of the superficial temporalis of three adult tufted capuchins (Sapajus apella) using biplanar videoradiography and the XROMM workflow. Architecture dynamics data were paired with regional fine-wire electromyography data from four adult tufted capuchins. Gape accounted for most architectural change across the temporalis, but architectural dynamics varied between regions. Mechanically challenging foods were associated with lower AGRs in the anterior region. The timing of most dynamic architectural changes did not vary between regions and differed from regional variation in static architecture. Collectively these findings suggest that, when modelling temporalis muscle force production in extant and fossil primates, it is important to account for the effects of gape, regionalization and food material properties. This article is part of the theme issue 'Food processing and nutritional assimilation in animals'.
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Affiliation(s)
- Myra F. Laird
- Department of Basic and Translational Sciences, University of Pennsylvania, Levy 443, 4010 Locust Street, Philadelphia, PA 19104, USA
| | - Jose Iriarte-Diaz
- Department of Biology, University of the South, Sewanee, TN 37383-1000, USA
| | - Craig D. Byron
- Department of Biology, Mercer University, Macon, GA 312014, USA
| | - Michael C. Granatosky
- Department of Anatomy, New York Institute of Technology, Old Westbury, NY 11545, USA
| | - Andrea B. Taylor
- Department of Foundational Biomedical Sciences, Touro University, Vallejo, CA 94592, USA
| | - Callum F. Ross
- Department of Organismal Biology and Anatomy, University of Chicago, Chicago, IL 60637, USA
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9
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Steer KE, Johnson ML, Adjerid K, Bond LE, Howe SP, Khalif A, Nkachukwu KC, Edmonds CE, German RZ, Mayerl CJ. The Function of the Mammal Extrinsic Tongue Musculature in the Transition from Suckling to Drinking. Integr Comp Biol 2023; 63:641-652. [PMID: 37160353 PMCID: PMC10503468 DOI: 10.1093/icb/icad023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2023] [Revised: 04/25/2023] [Accepted: 05/02/2023] [Indexed: 05/11/2023] Open
Abstract
The transition from suckling to drinking is a developmental pathway that all mammals take. In both behaviors, the tongue is the primary structure involved in acquiring, transporting, and swallowing the liquid. However, the two processes are fundamentally different: during suckling, the tongue must function as a pump to generate suction to move milk, whereas during drinking, the tongue moves backwards and forwards through the mouth to acquire and move water. Despite these fundamental differences, we have little understanding of how tongues role varies between these behaviors. We used an infant pig model to investigate the relationships between anatomy, physiology, and function of the tongue to examine how lingual function is modulated in the transition from infancy to adulthood. We found that while some muscles were proportionally largest at birth, others were proportionally larger at the time of weaning. Furthermore, we found variation in tongue movements between suckling and drinking along both the mediolateral and anteroposterior axes, resulting in differences in tongue deformation between the two behaviors. The extrinsic tongue muscles also changed in function differently between drinking and suckling. Genioglossus increased its activity and turned on and off earlier in the cycle during drinking, whereas hyoglossus fired at lower amplitudes during drinking, and turned on and off later in the cycle. Together, the data highlight the significant need for high neuroplasticity in the control of the tongue at a young age in mammals and suggest that the ability to do so is key in the ontogeny and evolution of feeding in these animals.
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Affiliation(s)
- K E Steer
- Department of Anatomy and Neurobiology, Northeast Ohio Medical University, Rootstown OH 44272, USA
- Department of Biological Sciences, Northern Arizona University, Flagstaff, AZ 86011, USA
| | - M L Johnson
- Department of Anatomy and Neurobiology, Northeast Ohio Medical University, Rootstown OH 44272, USA
| | - K Adjerid
- Department of Anatomy and Neurobiology, Northeast Ohio Medical University, Rootstown OH 44272, USA
- Department of Biomedical Engineering, Tulane University, New Orleans, Lousiana, 70118, USA
| | - L E Bond
- Department of Anatomy and Neurobiology, Northeast Ohio Medical University, Rootstown OH 44272, USA
| | - S P Howe
- Department of Anatomy and Neurobiology, Northeast Ohio Medical University, Rootstown OH 44272, USA
| | - A Khalif
- Department of Anatomy and Neurobiology, Northeast Ohio Medical University, Rootstown OH 44272, USA
| | - K C Nkachukwu
- Department of Anatomy and Neurobiology, Northeast Ohio Medical University, Rootstown OH 44272, USA
| | - C E Edmonds
- Department of Anatomy and Neurobiology, Northeast Ohio Medical University, Rootstown OH 44272, USA
- School of Biomedical Sciences, Kent State University, Kent, OH 44242, USA
| | - R Z German
- Department of Anatomy and Neurobiology, Northeast Ohio Medical University, Rootstown OH 44272, USA
| | - C J Mayerl
- Department of Biological Sciences, Northern Arizona University, Flagstaff, AZ 86011, USA
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10
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Morse PE, Pampush JD, Kay RF. Dental topography of the Oligocene anthropoids Aegyptopithecus zeuxis and Apidium phiomense: Paleodietary insights from analysis of wear series. J Hum Evol 2023; 180:103387. [PMID: 37245335 DOI: 10.1016/j.jhevol.2023.103387] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2022] [Revised: 04/19/2023] [Accepted: 04/21/2023] [Indexed: 05/30/2023]
Abstract
Fossil primate dietary inference is enhanced when ascertained through multiple, distinct proxies. Dental topography can be used to assess changes in occlusal morphology with macrowear, providing insight on tooth use and function across the lifespans of individuals. We measured convex Dirichlet normal energy-a dental topography metric reflecting occlusal sharpness of features such as cusps and crests-in macrowear series of the second mandibular molars of two African anthropoid taxa from ∼30 Ma (Aegyptopithecus zeuxis and Apidium phiomense). Wear was quantified via three proxies: occlusal dentine exposure, inverse relief index, and inverse occlusal relief. The same measurements were calculated on macrowear series of four extant platyrrhine taxa (Alouatta, Ateles, Plecturocebus, and Sapajus apella) to provide an analogical framework for dietary inference in the fossil taxa. We predicted that Ae. zeuxis and Ap. phiomense would show similar patterns in topographic change with wear to one another and to extant platyrrhine frugivores like Ateles and Plecturocebus. The fossil taxa have similar distributions of convex Dirichlet normal energy to one another, and high amounts of concave Dirichlet normal energy 'noise' in unworn molars-a pattern shared with extant hominids that may distort dietary interpretations. Inverse relief index was the most useful wear proxy for comparison among the taxa in this study which possess disparate enamel thicknesses. Contrary to expectations, Ae. zeuxis and Ap. phiomense both resemble S. apella in exhibiting an initial decline in convex Dirichlet normal energy followed by an increase at the latest stages of wear as measured by inverse relief index, lending support to previous suggestions that hard-object feeding played a role in their dietary ecology. Based on these results and previous analyses of molar shearing quotients, microwear, and enamel microstructure, we suggest that Ae. zeuxis had a pitheciine-like strategy of seed predation, whereas Ap. phiomense potentially consumed berry-like compound fruits with hard seeds.
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Affiliation(s)
- Paul E Morse
- Department of Cell and Developmental Biology, University of Colorado School of Medicine, Aurora, CO 80045, USA; Florida Museum of Natural History, University of Florida, Gainesville, FL 32611, USA.
| | - James D Pampush
- Department of Exercise Science, High Point University, High Point, NC 27260, USA; Department of Physician Assistant Studies, High Point University, High Point, NC 27260, USA
| | - Richard F Kay
- Department of Evolutionary Anthropology, Duke University, Durham, NC 27708, USA; Division of Earth and Climate Sciences, Nicholas School, Duke University, Durham, NC 27708, USA
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11
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Byron C, Reed D, Iriarte-Diaz J, Wang Q, Strait D, Laird MF, Ross CF. Sagittal suture strain in capuchin monkeys (Sapajus and Cebus) during feeding. AMERICAN JOURNAL OF BIOLOGICAL ANTHROPOLOGY 2023; 180:633-654. [PMID: 36790169 DOI: 10.1002/ajpa.24701] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/24/2022] [Revised: 12/13/2022] [Accepted: 01/16/2023] [Indexed: 05/26/2023]
Abstract
OBJECTIVES Morphological variation in cranial sutures is used to infer aspects of primate feeding behavior, including diet, but strain regimes across sutures are not well documented. Our aim is to test hypotheses about sagittal suture morphology, strain regime, feeding behavior, and muscle activity relationships in robust Sapajus and gracile Cebus capuchin primates. MATERIALS AND METHODS Morphometrics of sinuosity in three regions of the sagittal suture were compared among museum specimens of Sapajus and Cebus, as well as in robust and gracile lab specimens. In vivo strains and bilateral electromyographic (EMG) activity were recorded from these regions in the temporalis muscles of capuchin primates while they fed on mechanically-varying foods. RESULTS Sapajus and the anterior suture region exhibited greater sinuosity than Cebus and posterior regions. In vivo data reveal minor differences in strain regime between robust and gracile phenotypes but show higher strain magnitudes in the middle suture region and higher tensile strains anteriorly. After gage location, feeding behavior has the most consistent and strongest impact on strain regime in the sagittal suture. Strain in the anterior suture has a high tension to compression ratio compared to the posterior region, especially during forceful biting in the robust Sapajus-like individual. DISCUSSION Sagittal suture complexity in robust capuchins likely reflects feeding behaviors associated with mechanically challenging foods. Sutural strain regimes in other anthropoid primates may also be affected by activity in feeding muscles.
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Affiliation(s)
- Craig Byron
- Department of Biology, Mercer University, Macon, Georgia, USA
| | - David Reed
- Department of Oral Biology, University of Illinois, Chicago, Illinois, USA
| | - Jose Iriarte-Diaz
- Department of Biology, University of the South, Sewanee, Tennessee, USA
| | - Qian Wang
- Department of Biomedical Sciences, Texas A&M University College of Dentistry, Dallas, Texas, USA
| | - David Strait
- Department of Anthropology, Washington University in St. Louis, St. Louis, Missouri, USA
- Palaeo-Research Institute, University of Johannesburg, Johannesburg, South Africa
| | - Myra F Laird
- Department of Basic and Translational Sciences, School of Dental Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Callum F Ross
- Department of Organismal Biology and Anatomy, University of Chicago, Chicago, Illinois, USA
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12
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Dickinson E, Hartstone-Rose A. Behavioral correlates of fascicular organization: The confluence of muscle architectural anatomy and function. Anat Rec (Hoboken) 2023. [PMID: 36880440 DOI: 10.1002/ar.25187] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2022] [Revised: 01/20/2023] [Accepted: 02/16/2023] [Indexed: 03/08/2023]
Abstract
Muscle is a complex tissue that has been studied on numerous hierarchical levels: from gross descriptions of muscle organization to cellular analyses of fiber profiles. In the middle of this space between organismal and cellular biology lies muscle architecture, the level at which functional correlations between a muscle's internal fiber organization and contractile abilities are explored. In this review, we summarize this relationship, detail recent advances in our understanding of this form-function paradigm, and highlight the role played by The Anatomical Record in advancing our understanding of functional morphology within muscle over the past two decades. In so doing, we honor the legacy of Editor-in-Chief Kurt Albertine, whose stewardship of the journal from 2006 through 2020 oversaw the flourishing of myological research, including numerous special issues dedicated to exploring the behavioral correlates of myology across diverse taxa. This legacy has seen the The Anatomical Record establish itself as a preeminent source of myological research, and a true leader within the field of comparative anatomy and functional morphology.
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Affiliation(s)
- Edwin Dickinson
- Department of Anatomy, New York Institute of Technology College of Osteopathic Medicine, Old Westbury, New York, USA
| | - Adam Hartstone-Rose
- Department of Biological Sciences, North Carolina State University, Raleigh, North Carolina, USA
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13
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Dickinson E, Young MW, Granatosky MC. In vivo
bite force in lovebirds (
Agapornis roseicollis
, Psittaciformes) and their relative biting performance among birds. J Zool (1987) 2022. [DOI: 10.1111/jzo.13014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Affiliation(s)
- E. Dickinson
- Department of Anatomy, College of Osteopathic Medicine New York Institute of Technology Old Westbury NY USA
| | - M. W. Young
- Department of Anatomy, College of Osteopathic Medicine New York Institute of Technology Old Westbury NY USA
| | - M. C. Granatosky
- Department of Anatomy, College of Osteopathic Medicine New York Institute of Technology Old Westbury NY USA
- Center for Biomedical Innovation New York Institute of Technology College of Osteopathic Medicine Old Westbury NY USA
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14
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Laird MF, Punjani Z, Oshay RR, Wright BW, Fogaça MD, Casteren A, Izar P, Visalberghi E, Fragazy D, Strait DS, Ross CF, Wright KA. Feeding postural behaviors and food geometric and material properties in bearded capuchin monkeys (
Sapajus libidinosus
). AMERICAN JOURNAL OF BIOLOGICAL ANTHROPOLOGY 2022. [PMCID: PMC9305483 DOI: 10.1002/ajpa.24501] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Objectives Foods that are geometrically and mechanically challenging to eat have been associated with specializations in feeding behavior and craniodental morphology across primates, and many of these foods are embedded, requiring a variety of positional behaviors during feeding. However, variation in positional behaviors in response to food properties is not well understood. Here, we examine differences in feeding postural behaviors across feeding events in relation to substrate and food geometric and material properties in a species of extractive foragers, bearded capuchins (Sapajus libidinosus). Methods and materials We coded over 1400 co‐occurring postural and feeding behaviors, their durations, and relative sizes of substrate and food from videos recorded at Fazenda Boa Vista in Gilbués, Piauí, Brazil. Food material properties were measured from foods collected at the time of the video recordings. Results Our results suggest that bearded capuchin feeding postures significantly differ across the feeding sequence, with substrate size, and between foods of high and low toughness and elastic modulus. Feeding postures were less variable for highly mechanically challenging foods. Food size also had a significant effect on postural behaviors. Large foods were more likely to be associated with suspended postures and small foods with sitting and squatting. Feeding postural behaviors were best explained by a combination of substrate and food variables. Conclusions Our results indicate that food geometric and mechanical properties have a significant influence on feeding postural behaviors in bearded capuchins. We posit that feeding postural behaviors reflect a combination of substrate variables and food properties, and large, mechanically challenging foods have a limiting effect on postural variation.
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Affiliation(s)
- Myra F. Laird
- Department of Integrative Anatomical Sciences University of Southern California Los Angeles California USA
| | - Zeenia Punjani
- Department of Integrative Anatomical Sciences University of Southern California Los Angeles California USA
| | - Rachel R. Oshay
- Department of Integrative Anatomical Sciences University of Southern California Los Angeles California USA
| | - Barth W. Wright
- Department of Surgery University of Kansas Medical Center Kansas City Kansas USA
| | - Mariana Dutra Fogaça
- Department of Biomedical Sciences Institute of Population Genetics, University of Veterinary Medicine Vienna Austria
- Neotropical Primates Research Group – NeoPReGo São Paulo Brazil
| | - Adam Casteren
- Department of Human Evolution Max Planck Institute for Evolutionary Anthropology Leipzig Germany
| | - Patrícia Izar
- Department of Experimental Psychology University of São Paulo São Paulo Brazil
| | - Elisabetta Visalberghi
- Institute of Cognitive Sciences and Technologies, National Research Council (CNR) Rome Italy
| | - Dorothy Fragazy
- Department of Psychology University of Georgia Athens Georgia USA
| | - David S. Strait
- Department of Anthropology Washington University in St. Louis St. Louis Missouri USA
- Palaeo‐Research Institute, University of Johannesburg, Cnr Kingsway and University Road Auckland Park Auckland Park South Africa
| | - Callum F. Ross
- Department of Organismal Biology and Anatomy University of Chicago Chicago Illinois USA
| | - Kristin A. Wright
- Department of Biomedical Sciences University of Missouri Kansas City School of Medicine Kansas City Missouri USA
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15
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Deutsch AR, Dickinson E, Whichard VA, Lagomarsino GR, Perry JMG, Kupczik K, Hartstone-Rose A. Primate body mass and dietary correlates of tooth root surface area. AMERICAN JOURNAL OF BIOLOGICAL ANTHROPOLOGY 2022; 177:4-26. [PMID: 36787710 DOI: 10.1002/ajpa.24430] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/21/2021] [Revised: 08/26/2021] [Accepted: 09/22/2021] [Indexed: 11/10/2022]
Abstract
OBJECTIVES This study aims to examine primate postcanine tooth root surface area (TRSA) in the context of two ecological variables (diet and bite force). We also assess scaling relationships within distinct taxonomic groups and across the order as a whole. MATERIALS AND METHODS Mandibular postcanine TRSA was measured using a three-dimensional computed tomography (CT) method for catarrhine (N = 27), platyrrhine (N = 21), and strepsirrhine (N = 24) taxa; this represents the first sample of strepsirrhines. Two different body size proxies were used: cranial geometric mean (GM) using nine linear measurements, and literature-derived body mass (BM). RESULTS TRSA correlated strongly with body size, scaling with positive allometry or isometry across the order as a whole; however, scaling differed significantly between taxa for some teeth. Among Strepsirrhini, molar TRSA relative to GM differed significantly between folivores and pliant-object feeders. Additionally, P4 TRSA relative to BM differentiated folivores from both hard- and pliant-object feeders. Among Cercopithecoidea, P4 TRSA adjusted by GM differed between hard- and pliant-object feeders. DISCUSSION Dietary signals in TRSA appear primarily driven by high frequency loading experienced by folivores. Stronger and more frequent dietary signals were observed within Strepsirrhini relative to Haplorhini. This may reflect the constraints of orthognathism within the latter, constraining the adaptability of their postcanine teeth. Finally, because of the strong correlation between TRSA and BM for each tooth locus (mean r2 = 0.82), TRSA can be used to predict BM in fossil primates using provided equations.
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Affiliation(s)
- Ashley R Deutsch
- Department of Biological Sciences, North Carolina State University, Raleigh, North Carolina, USA
| | - Edwin Dickinson
- Department of Biological Sciences, North Carolina State University, Raleigh, North Carolina, USA
| | - Victoria A Whichard
- Department of Biological Sciences, North Carolina State University, Raleigh, North Carolina, USA
| | - Giulia R Lagomarsino
- Department of Biological Sciences, North Carolina State University, Raleigh, North Carolina, USA
| | - Jonathan M G Perry
- Department of Physical Therapy Education, Western University of Health Sciences, Lebanon, Oregon, USA
| | - Kornelius Kupczik
- Department of Human Evolution, Max Planck Institute for Evolutionary Anthropology, Leipzig, Germany.,Department of Anthropology, University of Chile, Santiago, Chile
| | - Adam Hartstone-Rose
- Department of Biological Sciences, North Carolina State University, Raleigh, North Carolina, USA
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16
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Mayerl CJ, Steer KE, Chava AM, Bond LE, Edmonds CE, Gould FDH, Hieronymous TL, Vinyard CJ, German RZ. Anatomical and physiological variation of the hyoid musculature during swallowing in infant pigs. J Exp Biol 2021; 224:jeb243075. [PMID: 34734633 PMCID: PMC10659033 DOI: 10.1242/jeb.243075] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2021] [Accepted: 10/06/2021] [Indexed: 11/20/2022]
Abstract
The function of a muscle is impacted by its line of action, activity timing and contractile characteristics when active, all of which have the potential to vary within a behavior. One function of the hyoid musculature is to move the hyoid bone during swallowing, yet we have little insight into how their lines of action and contractile characteristics might change during a swallow. We used an infant pig model to quantify the contractile characteristics of four hyoid muscles during a swallow using synchronized electromyography, fluoromicrometry and high-speed biplanar videofluoroscopy. We also estimated muscle line of action during a swallow using contrast-enhanced CT-scanned muscles animated to move with the hyoid bone and found that as the hyoid elevated, the line of action of the muscles attached to it became greater in depression. We also found that muscles acted eccentrically and concentrically, which was correlated with hyoid movement. This work contributes to our understanding of how the musculature powering feeding functions during swallowing.
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Affiliation(s)
- Christopher J. Mayerl
- NEOMED Department of Anatomy and Neurobiology, Northeast Ohio Medical University, 4209 State Route 44, PO Box 95, Rootstown, OH 44272, USA
| | - Kendall E. Steer
- NEOMED Department of Anatomy and Neurobiology, Northeast Ohio Medical University, 4209 State Route 44, PO Box 95, Rootstown, OH 44272, USA
| | - Almasi M. Chava
- NEOMED Department of Anatomy and Neurobiology, Northeast Ohio Medical University, 4209 State Route 44, PO Box 95, Rootstown, OH 44272, USA
| | - Laura E. Bond
- NEOMED Department of Anatomy and Neurobiology, Northeast Ohio Medical University, 4209 State Route 44, PO Box 95, Rootstown, OH 44272, USA
| | - Chloe E. Edmonds
- NEOMED Department of Anatomy and Neurobiology, Northeast Ohio Medical University, 4209 State Route 44, PO Box 95, Rootstown, OH 44272, USA
| | - Francois D. H. Gould
- Department of Cell Biology and Neuroscience, Rowan School of Osteopathic Medicine, Stratford, NJ 08084, USA
| | - Tobin L. Hieronymous
- NEOMED Department of Anatomy and Neurobiology, Northeast Ohio Medical University, 4209 State Route 44, PO Box 95, Rootstown, OH 44272, USA
| | - Christopher J. Vinyard
- NEOMED Department of Anatomy and Neurobiology, Northeast Ohio Medical University, 4209 State Route 44, PO Box 95, Rootstown, OH 44272, USA
| | - Rebecca Z. German
- NEOMED Department of Anatomy and Neurobiology, Northeast Ohio Medical University, 4209 State Route 44, PO Box 95, Rootstown, OH 44272, USA
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17
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Holmes M, Taylor AB. The influence of jaw-muscle fibre-type phenotypes on estimating maximum muscle and bite forces in primates. Interface Focus 2021; 11:20210009. [PMID: 34938437 PMCID: PMC8361599 DOI: 10.1098/rsfs.2021.0009] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/09/2021] [Indexed: 02/06/2023] Open
Abstract
Numerous anthropological studies have been aimed at estimating jaw-adductor muscle forces, which, in turn, are used to estimate bite force. While primate jaw adductors show considerable intra- and intermuscular heterogeneity in fibre types, studies generally model jaw-muscle forces by treating the jaw adductors as either homogeneously slow or homogeneously fast muscles. Here, we provide a novel extension of such studies by integrating fibre architecture, fibre types and fibre-specific tensions to estimate maximum muscle forces in the masseter and temporalis of five anthropoid primates: Sapajus apella (N = 3), Cercocebus atys (N = 4), Macaca fascicularis (N = 3), Gorilla gorilla (N = 1) and Pan troglodytes (N = 2). We calculated maximum muscle forces by proportionally adjusting muscle physiological cross-sectional areas by their fibre types and associated specific tensions. Our results show that the jaw adductors of our sample ubiquitously express MHC α-cardiac, which has low specific tension, and hybrid fibres. We find that treating the jaw adductors as either homogeneously slow or fast muscles potentially overestimates average maximum muscle forces by as much as approximately 44%. Including fibre types and their specific tensions is thus likely to improve jaw-muscle and bite force estimates in primates.
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Affiliation(s)
- Megan Holmes
- Department of Family Medicine and Community Health, Duke University School of Medicine, Durham, NC, USA
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18
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Berthaume MA, Kramer PA. Anthroengineering: an independent interdisciplinary field. Interface Focus 2021; 11:20200056. [PMID: 34938428 PMCID: PMC8361575 DOI: 10.1098/rsfs.2020.0056] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/07/2021] [Indexed: 12/31/2022] Open
Abstract
In recent decades, funding agencies, institutes and professional bodies have recognized the profound benefits of transdisciplinarity in tackling targeted research questions. However, once questions are answered, the previously abundant support often dissolves. As such, the long-term benefits of these transdisciplinary approaches are never fully achieved. Over the last several decades, the integration of anthropology and engineering through inter- and multidisciplinary work has led to advances in fields such as design, human evolution and medical technologies. The lack of formal recognition, however, of this transdisciplinary approach as a unique entity rather than a useful tool or a subfield makes it difficult for researchers to establish laboratories, secure permanent jobs, fund long-term research programmes and train students in this approach. To facilitate the growth and development and witness the long-term benefits of this approach, we propose the integration of anthropology and engineering be recognized as a new, independent field known as anthroengineering. We present a working definition for anthroengineering and examples of how anthroengineering has been used. We discuss the necessity of recognizing anthroengineering as a unique field and explore potential novel applications. Finally, we discuss the future of anthroengineering, highlighting avenues for moving the field forward.
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Affiliation(s)
- Michael A. Berthaume
- Division of Mechanical Engineering and Design, London South Bank University, London SE1 0AA, UK
| | - Patricia Ann Kramer
- Department of Anthropology, University of Washington, Seattle, WA 98195-3100, USA
- Department of Orthopaedics and Sports Medicine, University of Washington, Seattle, WA 98195-3100, USA
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19
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Dickinson E, Pastor F, Santana SE, Hartstone-Rose A. Functional and ecological correlates of the primate jaw abductors. Anat Rec (Hoboken) 2021; 305:1245-1263. [PMID: 34505739 DOI: 10.1002/ar.24772] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2021] [Revised: 08/10/2021] [Accepted: 08/12/2021] [Indexed: 01/08/2023]
Abstract
While the adductor musculature of the primate jaw has been extensively analyzed within the context of dietary and social ecology, little is known about the corresponding muscles of jaw abduction. Nonetheless, these muscles significantly contribute to a species' maximum gape potential, and thus might constrain dietary niche diversity and impact social display behaviors. In this study, we quantify the architectural properties of the digastric (a jaw abductor) and lateral pterygoid (a jaw abductor and anterior translator) across a broad sample of male and female anthropoid primates. We test the hypothesis that the abductor musculature reflects specialization to dietary and behavioral ecology. Our sample comprises 14 catarrhine and 13 platyrrhine species spanning a wide range of dietary and social categories. All specimens were sharp dissected and muscles subsequently chemically digested using a standardized protocol. Our findings demonstrate that relative fascicle lengths within the lateral pterygoid (but not the digastric) are significantly greater within species that habitually consume larger food items. Meanwhile, canine length is more strongly associated with fascicle lengths in the digastric than in the lateral pterygoid, particularly within males. Neither dietary mechanical resistance nor the intensity of social competition relates to the size or architectural properties of the jaw abductors. These findings suggest that dietary-and to a lesser extent, socioecological-aspects of a primate's life history may be reflected in the architecture of these muscles, albeit to varying degrees. This underlines the importance of considering the complete masticatory apparatus when interpreting the evolution of the primate jaw.
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Affiliation(s)
- Edwin Dickinson
- Department of Biological Sciences, North Carolina State University, Raleigh, North Carolina, USA
| | - Francisco Pastor
- Departamento de Anatomia y Radiologia, Universidad de Valladolid, Valladolid, Spain
| | - Sharlene E Santana
- Department of Biology and Burke Museum of Natural History and Culture, University of Washington, Seattle, Washington, USA
| | - Adam Hartstone-Rose
- Department of Biological Sciences, North Carolina State University, Raleigh, North Carolina, USA
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20
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Leonard KC, Worden N, Boettcher ML, Dickinson E, Hartstone-Rose A. Effects of long-term ethanol storage on muscle architecture. Anat Rec (Hoboken) 2021; 305:184-198. [PMID: 33843155 DOI: 10.1002/ar.24638] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2021] [Revised: 03/03/2021] [Accepted: 03/05/2021] [Indexed: 12/28/2022]
Abstract
Muscle excursion and force potential can be estimated from architectural variables, including mass, volume, fascicle length, and density. These have been collected from fresh specimens, preserved specimens, and sometimes mixed samples of both. However, preservation alters the gross morphology of muscles. This study aims to quantify the effects of long-term storage on myological properties across a sample of fresh and ethanol preserved Mus musculus specimens ranging in storage time from 16 to 130 years. Masses, volumes, and densities of biceps femoris, quadriceps femoris, and triceps surae were measured, and histological cross-sections of some specimens were used to evaluate the microscale effects of long-term fluid preservation. For the remainder of the sample, chemically dissected fascicle lengths were measured to evaluate the fixation effects on the linear dimensions of muscle architecture. Relative muscle mass, volume, fascicle length, average fiber area, and density, and percent fiber area were regressed against years stored in ethanol. Muscle size dropped steeply between fresh and stored samples, ultimately decreasing by 62 and 60%, respectively. These losses correlate with histologically measured shrinking of average muscle fiber area. Density of stored specimens plateaued 5% below that of fresh ones. Although muscles lost mass and volume during ethanol storage, fascicle lengths did not shorten significantly (presumably because they were preserved attached on either end to bone). This study demonstrates that muscle mass, volume, and density of specimens stored long-term in ethanol should be corrected by factors of 2.64, 2.49, and 1.054 respectively for comparability to fresh specimens.
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Affiliation(s)
- Kaitlyn C Leonard
- Department of Biological Sciences, North Carolina State University, Raleigh, North Carolina, USA.,Department of Biological Sciences, Meredith College, Raleigh, North Carolina, USA
| | - Nikole Worden
- Department of Biological Sciences, North Carolina State University, Raleigh, North Carolina, USA
| | - Marissa L Boettcher
- College of Medicine, Medical University of South Carolina, Charleston, South Carolina, USA
| | - Edwin Dickinson
- Department of Biological Sciences, North Carolina State University, Raleigh, North Carolina, USA
| | - Adam Hartstone-Rose
- Department of Biological Sciences, North Carolina State University, Raleigh, North Carolina, USA
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21
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Abstract
Physiological cross-sectional area (PCSA), an important biomechanical variable, is an estimate of a muscle's contractile force potential and is derived from dividing muscle mass by the product of a muscle's average fascicle length and a theoretical constant representing the density of mammalian skeletal muscle. This density constant is usually taken from experimental studies of small samples of several model taxa using tissues collected predominantly from the lower limbs of adult animals. The generalized application of this constant to broader analyses of mammalian myology assumes that muscle density (1) is consistent across anatomical regions and (2) is unaffected by the aging process. To investigate the validity of these assumptions, we studied muscles of rabbits (Oryctolagus cuniculus) in the largest sample heretofore investigated explicitly for these variables, and we did so from numerous anatomical regions and from three different age-cohorts. Differences in muscle density and histology as a consequence of age and anatomical region were evaluated using Tukey's HSD tests. Overall, we observed that older individuals tend to have denser muscles than younger individuals. Our findings also demonstrated significant differences in muscle density between anatomic regions within the older cohorts, though none in the youngest cohort. Approximately 50% of the variation in muscle density can be explained histologically by the average muscle fiber area and the average percent fiber area. That is, muscles with larger average fiber areas and a higher proportion of fiber area tend to be denser. Importantly, using the age and region dependent measurements of muscle density that we provide may increase the accuracy of PCSA estimations. Although we found statistically significant differences related to ontogeny and anatomical region, if density cannot be measured directly, the specific values presented herein should be used to improve accuracy. If a single muscle density constant that has been better validated than the ones presented in the previous literature is preferred, then 1.0558 and 1.0502 g/cm3 would be reasonable constants to use across all adult and juvenile muscles respectively.
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22
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Ingestive behaviors in bearded capuchins (Sapajus libidinosus). Sci Rep 2020; 10:20850. [PMID: 33257755 PMCID: PMC7705727 DOI: 10.1038/s41598-020-77797-2] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2020] [Accepted: 11/17/2020] [Indexed: 11/25/2022] Open
Abstract
The biomechanical and adaptive significance of variation in craniodental and mandibular morphology in fossil hominins is not always clear, at least in part because of a poor understanding of how different feeding behaviors impact feeding system design (form–function relationships). While laboratory studies suggest that ingestive behaviors produce variable loading, stress, and strain regimes in the cranium and mandible, understanding the relative importance of these behaviors for feeding system design requires data on their use in wild populations. Here we assess the frequencies and durations of manual, ingestive, and masticatory behaviors from more than 1400 observations of feeding behaviors video-recorded in a wild population of bearded capuchins (Sapajus libidinosus) at Fazenda Boa Vista in Piauí, Brazil. Our results suggest that ingestive behaviors in wild Sapajus libidinosus were used for a range of food material properties and typically performed using the anterior dentition. Coupled with previous laboratory work indicating that ingestive behaviors are associated with higher mandibular strain magnitudes than mastication, these results suggest that ingestive behaviors may play an important role in craniodental and mandibular design in capuchins and may be reflected in robust adaptations in fossil hominins.
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23
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Panagiotopoulou O, Iriarte-Diaz J, Mehari Abraha H, Taylor AB, Wilshin S, Dechow PC, Ross CF. Biomechanics of the mandible of Macaca mulatta during the power stroke of mastication: Loading, deformation, and strain regimes and the impact of food type. J Hum Evol 2020; 147:102865. [PMID: 32905895 PMCID: PMC7541691 DOI: 10.1016/j.jhevol.2020.102865] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2020] [Revised: 07/21/2020] [Accepted: 07/21/2020] [Indexed: 12/26/2022]
Abstract
Mandible morphology has yet to yield definitive information on primate diet, probably because of poor understanding of mandibular loading and strain regimes, and overreliance on simple beam models of mandibular mechanics. We used a finite element model of a macaque mandible to test hypotheses about mandibular loading and strain regimes and relate variation in muscle activity during chewing on different foods to variation in strain regimes. The balancing-side corpus is loaded primarily by sagittal shear forces and sagittal bending moments. On the working side, sagittal bending moments, anteroposterior twisting moments, and lateral transverse bending moments all reach similar maxima below the bite point; sagittal shear is the dominant loading regime behind the bite point; and the corpus is twisted such that the mandibular base is inverted. In the symphyseal region, the predominant loading regimes are lateral transverse bending and negative twisting about a mediolateral axis. Compared with grape and dried fruit chewing, nut chewing is associated with larger sagittal and transverse bending moments acting on balancing- and working-side mandibles, larger sagittal shear on the working side, and larger twisting moments about vertical and transverse axes in the symphyseal region. Nut chewing is also associated with higher minimum principal strain magnitudes in the balancing-side posterior ramus; higher sagittal shear strain magnitudes in the working-side buccal alveolar process and the balancing-side oblique line, recessus mandibulae, and endocondylar ridge; and higher transverse shear strains in the symphyseal region, the balancing-side medial prominence, and the balancing-side endocondylar ridge. The largest food-related differences in maximum principal and transverse shear strain magnitudes are in the transverse tori and in the balancing-side medial prominence, extramolar sulcus, oblique line, and endocondylar ridge. Food effects on the strain regime are most salient in areas not traditionally investigated, suggesting that studies seeking dietary effects on mandible morphology might be looking in the wrong places.
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Affiliation(s)
- Olga Panagiotopoulou
- Department of Anatomy & Developmental Biology, Monash Biomedicine Discovery Institute, Faculty of Medicine Nursing and Health Sciences, Monash University, Clayton, Melbourne, Victoria, 3800, Australia.
| | - Jose Iriarte-Diaz
- Department of Biology, University of the South, Sewanee, TN, 37383, USA
| | - Hyab Mehari Abraha
- Department of Anatomy & Developmental Biology, Monash Biomedicine Discovery Institute, Faculty of Medicine Nursing and Health Sciences, Monash University, Clayton, Melbourne, Victoria, 3800, Australia
| | | | - Simon Wilshin
- Comparative Biomedical Sciences, The Royal Veterinary College, Hawkshead Lane, Herts, AL97TA, UK
| | - Paul C Dechow
- Department of Biomedical Sciences, Texas A&M University College of Dentistry, Dallas, TX, USA
| | - Callum F Ross
- Department of Organismal Biology and Anatomy, University of Chicago, Chicago, IL, 60637, USA.
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Ferreira-Cardoso S, Fabre PH, de Thoisy B, Delsuc F, Hautier L. Comparative masticatory myology in anteaters and its implications for interpreting morphological convergence in myrmecophagous placentals. PeerJ 2020; 8:e9690. [PMID: 32983632 PMCID: PMC7491420 DOI: 10.7717/peerj.9690] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2020] [Accepted: 07/19/2020] [Indexed: 12/12/2022] Open
Abstract
BACKGROUND Ecological adaptations of mammals are reflected in the morphological diversity of their feeding apparatus, which includes differences in tooth crown morphologies, variation in snout size, or changes in muscles of the feeding apparatus. The adaptability of their feeding apparatus allowed them to optimize resource exploitation in a wide range of habitats. The combination of computer-assisted X-ray microtomography (µ-CT) with contrast-enhancing staining protocols has bolstered the reconstruction of three-dimensional (3D) models of muscles. This new approach allows for accurate descriptions of muscular anatomy, as well as the quick measurement of muscle volumes and fiber orientation. Ant- and termite-eating (myrmecophagy) represents a case of extreme feeding specialization, which is usually accompanied by tooth reduction or complete tooth loss, snout elongation, acquisition of a long vermiform tongue, and loss of the zygomatic arch. Many of these traits evolved independently in distantly-related mammalian lineages. Previous reports on South American anteaters (Vermilingua) have shown major changes in the masticatory, intermandibular, and lingual muscular apparatus. These changes have been related to a functional shift in the role of upper and lower jaws in the evolutionary context of their complete loss of teeth and masticatory ability. METHODS We used an iodine staining solution (I2KI) to perform contrast-enhanced µ-CT scanning on heads of the pygmy (Cyclopes didactylus), collared (Tamandua tetradactyla) and giant (Myrmecophaga tridactyla) anteaters. We reconstructed the musculature of the feeding apparatus of the three extant anteater genera using 3D reconstructions complemented with classical dissections of the specimens. We performed a description of the musculature of the feeding apparatus in the two morphologically divergent vermilinguan families (Myrmecophagidae and Cyclopedidae) and compared it to the association of morphological features found in other myrmecophagous placentals. RESULTS We found that pygmy anteaters (Cyclopes) present a relatively larger and architecturally complex temporal musculature than that of collared (Tamandua) and giant (Myrmecophaga) anteaters, but shows a reduced masseter musculature, including the loss of the deep masseter. The loss of this muscle concurs with the loss of the jugal bone in Cyclopedidae. We show that anteaters, pangolins, and aardvarks present distinct anatomies despite morphological and ecological convergences.
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Affiliation(s)
- Sérgio Ferreira-Cardoso
- CNRS, IRD, EPHE, Université de Montpellier, Institut des Sciences de l’Evolution de Montpellier (ISEM), Montpellier, France
| | - Pierre-Henri Fabre
- CNRS, IRD, EPHE, Université de Montpellier, Institut des Sciences de l’Evolution de Montpellier (ISEM), Montpellier, France
- Mammal Section, Life Sciences, Vertebrate Division, The Natural History Museum, London, United Kingdom
| | - Benoit de Thoisy
- Institut Pasteur de la Guyane, Cayenne, French Guiana, France
- Kwata NGO, Cayenne, French Guiana, France
| | - Frédéric Delsuc
- CNRS, IRD, EPHE, Université de Montpellier, Institut des Sciences de l’Evolution de Montpellier (ISEM), Montpellier, France
| | - Lionel Hautier
- CNRS, IRD, EPHE, Université de Montpellier, Institut des Sciences de l’Evolution de Montpellier (ISEM), Montpellier, France
- Mammal Section, Life Sciences, Vertebrate Division, The Natural History Museum, London, United Kingdom
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Granatosky MC, Ross CF. Differences in muscle mechanics underlie divergent optimality criteria between feeding and locomotor systems. J Anat 2020; 237:1072-1086. [PMID: 32671858 DOI: 10.1111/joa.13279] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2020] [Revised: 05/19/2020] [Accepted: 06/22/2020] [Indexed: 01/03/2023] Open
Abstract
Tetrapod musculoskeletal diversity is usually studied separately in feeding and locomotor systems. However, direct comparisons between these systems promise important insight into how natural selection deploys the same basic musculoskeletal toolkit-connective tissues, bones, nerves, and skeletal muscle-to meet the differing performance criteria of feeding and locomotion. Recent studies using this approach have proposed that the feeding system is optimized for precise application of high forces and the locomotor system is optimized for wide and rapid joint excursions for minimal energetic expenditure. If this hypothesis is correct, then it stands to reason that other anatomical and biomechanical variables within the feeding and locomotor systems should reflect these diverging functions. To test this hypothesis, we compared muscle moment arm lengths, mechanical advantages, and force vector orientations of two jaw elevator muscles (m. temporalis and m. superficial masseter), an elbow flexor (m. brachialis) and extensor (m. triceps- lateral head), and a knee flexor (m. biceps femoris-short head) and extensor (m. vastus lateralis) across 18 species of primates. Our results show that muscles of the feeding system are more orthogonally oriented relative to the resistance arm (mandible) and operate at relatively large moment arms and mechanical advantages. Moreover, these variables show relatively little change across the range of jaw excursion. In contrast, the representative muscles of the locomotor system have much smaller mechanical advantages and, depending on joint position, smaller muscle moment arm lengths and almost parallel orientations relative to the resistance arm. These patterns are consistent regardless of phylogeny, body mass, locomotor mode, and feeding specialization. We argue that these findings reflect fundamental functional dichotomies between tetrapod locomotor and feeding systems. By organizing muscles in a manner such that moment arms and mechanical advantage are relatively small, the locomotor system can produce broad joint excursions and high angular velocities with only small muscular contraction. As such, the anatomical organization of muscles within the limbs allows striding animals to move relatively rapidly and with minimal energetic expenditure. In contrast, the anatomical configuration of muscles in the feeding system, at least m. superficial masseter and m. temporalis, favors their force-producing capacity at the expense of excursion and velocity.
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Affiliation(s)
- Michael C Granatosky
- Department of Anatomy, New York Institute of Technology, Old Westbury, New York, USA
| | - Callum F Ross
- Department of Organismal Biology and Anatomy, University of Chicago, Chicago, Illinois, USA
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Laird MF, Granatosky MC, Taylor AB, Ross CF. Muscle architecture dynamics modulate performance of the superficial anterior temporalis muscle during chewing in capuchins. Sci Rep 2020; 10:6410. [PMID: 32286442 PMCID: PMC7156371 DOI: 10.1038/s41598-020-63376-y] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2019] [Accepted: 03/30/2020] [Indexed: 11/09/2022] Open
Abstract
Jaw-muscle architecture is a key determinant of jaw movements and bite force. While static length-force and force-velocity relationships are well documented in mammals, architecture dynamics of the chewing muscles and their impact on muscle performance are largely unknown. We provide novel data on how fiber architecture of the superficial anterior temporalis (SAT) varies dynamically during naturalistic feeding in tufted capuchins (Sapajus apella). We collected data on architecture dynamics (changes in muscle shape or the architectural gear ratio) during the gape cycle while subjects fed on foods of different mechanical properties. Architecture of the SAT varied with phases of the gape cycle, but gape distance accounted for the majority of dynamic changes in architecture. In addition, lower gear ratios (low muscle velocity relative to fascicle velocity) were observed when animals chewed on more mechanically resistant foods. At lower gear ratios, fibers rotated less during shortening resulting in smaller pinnation angles, a configuration that favors increased force production. Our results suggest that architectural dynamics may influence jaw-muscle performance by enabling the production of higher bite forces during the occlusal phase of the gape cycle and while processing mechanically challenging foods.
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Affiliation(s)
- Myra F Laird
- Department of Integrative Anatomical Sciences, University of Southern California, Los Angeles, CA, USA.
| | | | - Andrea B Taylor
- Basic Science Department, Touro University, Vallejo, CA, USA
| | - Callum F Ross
- Department of Organismal Biology and Anatomy, University of Chicago, Chicago, IL, USA
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Dickinson E, Kolli S, Schwenk A, Davis CE, Hartstone‐Rose A. DiceCT Analysis of the Extreme Gouging Adaptations Within the Masticatory Apparatus of the Aye‐Aye (
Daubentonia madagascariensis
). Anat Rec (Hoboken) 2019; 303:282-294. [DOI: 10.1002/ar.24303] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2019] [Revised: 10/03/2019] [Accepted: 10/05/2019] [Indexed: 12/17/2022]
Affiliation(s)
- Edwin Dickinson
- Department of Biological Sciences North Carolina State University Raleigh North Carolina
| | - Shruti Kolli
- Department of Biological Sciences North Carolina State University Raleigh North Carolina
| | - Alysa Schwenk
- Department of Biological Sciences North Carolina State University Raleigh North Carolina
| | - Cassidy E. Davis
- Department of Biological Sciences North Carolina State University Raleigh North Carolina
| | - Adam Hartstone‐Rose
- Department of Biological Sciences North Carolina State University Raleigh North Carolina
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Deutsch AR, Dickinson E, Leonard KC, Pastor F, Muchlinski MN, Hartstone‐Rose A. Scaling of Anatomically Derived Maximal Bite Force in Primates. Anat Rec (Hoboken) 2019; 303:2026-2035. [DOI: 10.1002/ar.24284] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2019] [Revised: 08/01/2019] [Accepted: 08/20/2019] [Indexed: 11/06/2022]
Affiliation(s)
- Ashley R. Deutsch
- Department of Anthropology University of Florida Gainesville Florida
| | - Edwin Dickinson
- Department of Biological Sciences North Carolina State University Raleigh North Carolina
| | - Kaitlyn C. Leonard
- Department of Biological Sciences North Carolina State University Raleigh North Carolina
| | - Francisco Pastor
- Departamento de Anatomia y Radiologia Universidad de Valladolid, Museo Anatomico Valladolid Spain
| | | | - Adam Hartstone‐Rose
- Department of Biological Sciences North Carolina State University Raleigh North Carolina
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Leonard KC, Boettcher ML, Dickinson E, Malhotra N, Aujard F, Herrel A, Hartstone‐Rose A. The Ontogeny of Masticatory Muscle Architecture in
Microcebus murinus. Anat Rec (Hoboken) 2019; 303:1364-1373. [DOI: 10.1002/ar.24259] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2019] [Revised: 07/01/2019] [Accepted: 07/04/2019] [Indexed: 12/22/2022]
Affiliation(s)
- Kaitlyn C. Leonard
- Department of Biological Sciences North Carolina State University Raleigh North Carolina
| | - Marissa L. Boettcher
- Department of Biological Sciences North Carolina State University Raleigh North Carolina
| | - Edwin Dickinson
- Department of Biological Sciences North Carolina State University Raleigh North Carolina
| | - Neha Malhotra
- University of South Carolina School of Medicine Columbia South Carolina
| | | | | | - Adam Hartstone‐Rose
- Department of Biological Sciences North Carolina State University Raleigh North Carolina
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Hartstone‐Rose A, Hertzig I, Dickinson E. Bite Force and Masticatory Muscle Architecture Adaptations in the Dietarily Diverse Musteloidea (Carnivora). Anat Rec (Hoboken) 2019; 302:2287-2299. [DOI: 10.1002/ar.24233] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2019] [Revised: 07/03/2019] [Accepted: 07/03/2019] [Indexed: 01/09/2023]
Affiliation(s)
- Adam Hartstone‐Rose
- Department of Biological Sciences North Carolina State University Raleigh North Carolina
| | - Isabella Hertzig
- Department of Biological Sciences North Carolina State University Raleigh North Carolina
| | - Edwin Dickinson
- Department of Biological Sciences North Carolina State University Raleigh North Carolina
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Taylor AB, Terhune CE, Vinyard CJ. The influence of masseter and temporalis sarcomere length operating ranges as determined by laser diffraction on architectural estimates of muscle force and excursion in macaques (Macaca fascicularis and Macaca mulatta). Arch Oral Biol 2019; 105:35-45. [PMID: 31254839 PMCID: PMC6739116 DOI: 10.1016/j.archoralbio.2019.05.015] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2019] [Revised: 05/16/2019] [Accepted: 05/18/2019] [Indexed: 11/25/2022]
Abstract
OBJECTIVE Determine sarcomere length (Ls) operating ranges of the superficial masseter and temporalis in vitro in a macaque model and examine the impact of position-dependent variation on Ls and architectural estimates of muscle function (i.e., fiber length, PCSA) before and after Ls-normalization. DESIGN Heads of adult Macaca fascicularis (n = 4) and M. mulatta (n = 3) were bisected postmortem. One side of the jaw was fixed in occlusion, the other in maximum gape. Ls was measured bilaterally using laser diffraction and these measurements were used to estimate sarcomere-length operating ranges. Differences in fiber length and PCSA between sides were tested for significance prior to and following Ls-normalization. RESULTS Sarcomere-length operating ranges were widest for the anterior superficial masseter and narrowest for the posterior temporalis. Compared with other mammals, macaque operating ranges were wider and shifted to the right of the descending limb of a representative length-tension curve. Fibers were significantly stretched by as much as 100%, and PCSAs reduced by as much as 43%, on the maximally gaped compared with occluded sides. Ls-normalization substantially reduced position-dependent variance. CONCLUSIONS The superficial masseter ranges between 87-143% and the temporalis between 88-130% of optimal Ls from maximum gape to occlusion, indicating maximum relative Ls for these macaque muscles exceeds the upper end range previously reported for the jaw muscles of smaller mammals. The wider macaque operating ranges may be functionally linked to the propensity for facially prognathic primates to engage in agonistic canine display behaviors that require jaw-muscle stretch to facilitate production of wide jaw gapes.
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Affiliation(s)
- Andrea B Taylor
- Department of Basic Science, Touro University, Vallejo, CA, United States.
| | - Claire E Terhune
- Department of Anthropology, University of Arkansas, Fayetteville, AR, United States.
| | - Christopher J Vinyard
- Department of Anatomy and Neurobiology, Northeast Ohio Medical University, Rootstown, OH, United States.
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Dickinson E, Basham C, Rana A, Hartstone‐Rose A. Visualization and Quantification of Digitally Dissected Muscle Fascicles in the Masticatory Muscles of
Callithrix jacchus
Using Nondestructive DiceCT. Anat Rec (Hoboken) 2019; 302:1891-1900. [DOI: 10.1002/ar.24212] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2019] [Revised: 02/26/2019] [Accepted: 03/27/2019] [Indexed: 01/10/2023]
Affiliation(s)
- Edwin Dickinson
- Department of Biological Sciences North Carolina State University Raleigh North Carolina
| | - Colin Basham
- Department of Mechanical, Aerospace, and Biomedical Engineering University of Tennessee Knoxville Tennessee
| | | | - Adam Hartstone‐Rose
- Department of Biological Sciences North Carolina State University Raleigh North Carolina
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Patterns and Constraints of Craniofacial Variation in Colobine Monkeys: Disentangling the Effects of Phylogeny, Allometry and Diet. Evol Biol 2019. [DOI: 10.1007/s11692-019-09469-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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ITO K, ENDO H. The effect of the masticatory muscle physiological cross-sectional area on the structure of the temporomandibular joint in Carnivora. J Vet Med Sci 2019; 81:389-396. [PMID: 30674744 PMCID: PMC6451921 DOI: 10.1292/jvms.18-0611] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/03/2022] Open
Abstract
We compared the temporomandibular joint structure between species of the order Carnivora and investigated its variation among family lineages. We also investigated the effect of the
masticatory muscle physiological cross-sectional area (PCSA) on temporomandibular joint structure. The masticatory muscle is composed of multiple muscles, which contract in different
directions and exert pressure on the temporomandibular joint. We investigated the effect of the ratio of each muscle’s PCSA—an indicator of muscle force—and muscle size relative to body size
on temporomandibular joint structure. The temporalis PCSA relative to body size showed the highest correlation with temporomandibular joint structure. When the temporalis PCSA is large
relative to body size, the preglenoid projects caudally, the postglenoid projects rostrally and the pre-postglenoid angle interval is small, indicating that the condyle is locked in the
fossa to reinforce the temporomandibular joint. Most Carnivora use blade-like carnassial teeth when slicing food. However, dislocation occurs when the carnassial teeth are used by the
temporalis muscle. Our results suggest that the temporomandibular joint is reinforced to prevent dislocation caused by the temporalis muscle. In Mustelidae, the temporomandibular joint with
a rostrally projecting postglenoid is suitable for carnassial biting using the temporalis muscle. In Felidae, the force of the masseter onto the carnassial teeth is diverted to the canine by
tightening the temporomandibular joint. In Canidae, the masticatory muscle arrangement is well-balanced, enabling combined action. Hence, reinforcement of the temporomandibular joint by bone
structure is unnecessary.
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Affiliation(s)
- Kai ITO
- Graduate School of Agricultural and Life Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
- The University Museum, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku Tokyo 113-0033, Japan
| | - Hideki ENDO
- Graduate School of Agricultural and Life Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
- The University Museum, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku Tokyo 113-0033, Japan
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Granatosky MC, McElroy EJ, Laird MF, Iriarte-Diaz J, Reilly SM, Taylor AB, Ross CF. Joint angular excursions during cyclical behaviors differ between tetrapod feeding and locomotor systems. J Exp Biol 2019; 222:jeb.200451. [DOI: 10.1242/jeb.200451] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2019] [Accepted: 04/05/2019] [Indexed: 12/14/2022]
Abstract
Tetrapod musculoskeletal diversity is usually studied separately in feeding and locomotor systems. However, comparisons between these systems promise important insight into how natural selection deploys the same basic musculoskeletal toolkit—connective tissues, bones, nerves and skeletal muscle—to meet the differing performance criteria of feeding and locomotion. In this study, we compare average joint angular excursions during cyclic behaviors– chewing, walking and running–in a phylogenetic context to explore differences in the optimality criteria of these two systems. Across 111 tetrapod species, average limb-joint angular excursions during cyclic locomotion are greater and more evolutionarily labile than those of the jaw joint during cyclic chewing. We argue that these findings reflect fundamental functional dichotomies between tetrapod locomotor and feeding systems. Tetrapod chewing systems are optimized for precise application of force over a narrower, more controlled and predictable range of displacements, the principal aim being to fracture the substrate, the size and mechanical properties of which are controlled at ingestion and further reduced and homogenized (respectively) by the chewing process. In contrast, tetrapod limbed locomotor systems are optimized for fast and energetically efficient application of force over a wider and less predictable range of displacements, the principal aim being to move the organism at varying speeds relative to a substrate whose geometry and mechanical properties need not become more homogenous as locomotion proceeds. Hence, the evolution of tetrapod locomotor systems has been accompanied by an increasing diversity of limb-joint excursions, as tetrapods have expanded across a range of locomotor substrates and environments.
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Affiliation(s)
- Michael C. Granatosky
- Department of Organismal Biology and Anatomy, University of Chicago, Chicago, IL, USA
| | - Eric J. McElroy
- Department of Biology, College of Charleston, Charleston, SC, USA
| | - Myra F. Laird
- Department of Organismal Biology and Anatomy, University of Chicago, Chicago, IL, USA
| | - Jose Iriarte-Diaz
- Department of Oral Biology, University of Illinois Chicago, Chicago, IL, USA
| | | | | | - Callum F. Ross
- Department of Organismal Biology and Anatomy, University of Chicago, Chicago, IL, USA
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Delgado MN, Pérez-Pérez A, Galbany J. Morphological variation and covariation in mandibular molars of platyrrhine primates. J Morphol 2018; 280:20-34. [PMID: 30556948 DOI: 10.1002/jmor.20907] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2017] [Revised: 08/08/2018] [Accepted: 09/23/2018] [Indexed: 11/07/2022]
Abstract
Molars are highly integrated biological structures that have been used for inferring evolutionary relationships among taxa. However, parallel and convergent morphological traits can be affected by developmental and functional constraints. Here, we analyze molar shapes of platyrrhines in order to explore if platyrrhine molar diversity reflects homogeneous patterns of molar variation and covariation. We digitized 30 landmarks on mandibular first and second molars of 418 extant and 11 fossil platyrrhine specimens to determine the degree of integration of both molars when treated as a single module. We combined morphological and phylogenetic data to investigate the phylogenetic signal and to visualize the history of molar shape changes. All platyrrhine taxa show a common shape pattern suggesting that a relatively low degree of phenotypic variation is caused by convergent evolution, although molar shape carries significant phylogenetic signal. Atelidae and Pitheciidae show high levels of integration with low variation between the two molars, whereas the Cebinae/Saimiriinae, and especially Callitrichinae, show greater variation between molars and trend toward a modular organization. We hypothesize that biomechanical constraints of the masticatory apparatus, and the dietary profile of each taxon are the main factors that determine high covariation in molars. In contrast, low molar shape covariation may result from the fact that each molar exhibits a distinct ecological signal, as molars can be exposed to distinct occlusal loadings during food processing, suggesting that different selective pressures on molars can reduce overall molar integration.
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Affiliation(s)
- Mónica Nova Delgado
- Department of Evolutionary Biology, Ecology and Environmental Sciences, University of Barcelona, Barcelona, Spain
| | - Alejandro Pérez-Pérez
- Department of Evolutionary Biology, Ecology and Environmental Sciences, University of Barcelona, Barcelona, Spain
| | - Jordi Galbany
- Department of Evolutionary Biology, Ecology and Environmental Sciences, University of Barcelona, Barcelona, Spain.,Department of Social Psychology and Quantitative Psychology, University of Barcelona, Barcelona, Spain
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Fricano EEI, Perry JMG. Maximum Bony Gape in Primates. Anat Rec (Hoboken) 2018; 302:215-225. [PMID: 30412348 DOI: 10.1002/ar.23897] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2017] [Revised: 12/14/2017] [Accepted: 12/27/2017] [Indexed: 11/08/2022]
Abstract
Maximum jaw gape has important functional implications for behavior and feeding habits in primates. It has been suggested that gape is correlated to canine height and ingested food size. Extending these correlations to the fossil record would provide insights about the diets and/or social behavior of extinct primates. However, this can be problematic due to uncertainty about size and location of musculature, and it depends on reliability and repeatability of maximum gape estimation using only skeletal elements. In this study, maximum bony gape (MBG) was estimated using reliable landmarks and repeatable methods. The cranium was fixed in position and then the mandible was rotated and translated to the point immediately prior to loss of condyle-glenoid contact. Then it was photographed in a steady position using an adjustable wooden frame. This protocol allowed for photographs and linear measurements to be obtained for many museum specimens in a short time. The sample included 203 individuals, representing 42 species of primates. When scaled for body size, linear MBG correlates with maximum anesthetized gape (Hylander: Am J Phys Anthropol 150 (2013) 247-259), ingested food size (Perry and Hartstone-Rose: Am J Phys Anthropol 142 (2010) 625-635), and canine length but not condylar height. Anat Rec, 302:215-225, 2019. © 2018 Wiley Periodicals, Inc.
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Affiliation(s)
- Ellen E I Fricano
- Center for Functional Anatomy and Evolution, Johns Hopkins University School of Medicine, 1830 East Monument Street, Baltimore, Maryland
| | - Jonathan M G Perry
- Center for Functional Anatomy and Evolution, Johns Hopkins University School of Medicine, 1830 East Monument Street, Baltimore, Maryland
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Dickinson E, Fitton LC, Kupczik K. Ontogenetic changes to muscle architectural properties within the jaw-adductor musculature of Macaca fascicularis. AMERICAN JOURNAL OF PHYSICAL ANTHROPOLOGY 2018; 167:291-310. [PMID: 30168867 DOI: 10.1002/ajpa.23628] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/25/2017] [Revised: 05/18/2018] [Accepted: 05/19/2018] [Indexed: 11/12/2022]
Abstract
OBJECTIVES Changes to soft- and hard-tissue components of the masticatory complex during development can impact functional performance by altering muscle excursion potential, maximum muscle forces, and the efficiency of force transfer to specific bitepoints. Within Macaca fascicularis, older individuals exploit larger, more mechanically resistant food items and more frequently utilize wide-gape jaw postures. We therefore predict that key architectural and biomechanical variables will scale during ontogeny to maximize bite force and gape potential within older, larger-bodied individuals. MATERIALS AND METHODS We analyzed 26 specimens of M. fascicularis, representing a full developmental spectrum. The temporalis, superficial masseter, and deep masseter were dissected to determine muscle mass, fiber length, and physiologic cross-sectional area (PCSA). Lever-arm lengths were also measured for each muscle, alongside the height of the temporomandibular joint (TMJ) and basicranial length. These variables were scaled against two biomechanical variables (jaw length and condyle-molar length) to determine relative developmental changes within these parameters. RESULTS During ontogeny, muscle mass, fiber length, and PCSA scaled with positive allometry relative to jaw length and condyle-molar length within all muscles. TMJ height also scaled with positive allometry, while muscle lever arms scaled with isometry relative to jaw length and with positive allometry (temporalis) or isometry (superficial and deep masseter) relative to condyle-molar length. CONCLUSION Larger individuals demonstrate adaptations during development towards maximizing gape potential and bite force potential at both an anterior and posterior bitepoint. These data provide anatomical evidence to support field observations of dietary and behavioral differences between juvenile and adult M. fascicularis.
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Affiliation(s)
- Edwin Dickinson
- Max Planck Weizmann Center for Integrative Archaeology and Anthropology Max Planck Institute for Evolutionary Anthropology, Leipzig, Germany.,Centre for Anatomical and Human Sciences Hull York Medical School, York, United Kingdom
| | - Laura C Fitton
- Centre for Anatomical and Human Sciences Hull York Medical School, York, United Kingdom
| | - Kornelius Kupczik
- Max Planck Weizmann Center for Integrative Archaeology and Anthropology Max Planck Institute for Evolutionary Anthropology, Leipzig, Germany
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Scott JE, Campbell RM, Baj LM, Burns MC, Price MS, Sykes JD, Vinyard CJ. Dietary signals in the premolar dentition of primates. J Hum Evol 2018; 121:221-234. [DOI: 10.1016/j.jhevol.2018.04.006] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2015] [Revised: 04/12/2018] [Accepted: 04/16/2018] [Indexed: 10/16/2022]
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Perry JMG, Prufrock KA. Muscle Functional Morphology in Paleobiology: The Past, Present, and Future of “Paleomyology”. Anat Rec (Hoboken) 2018; 301:538-555. [DOI: 10.1002/ar.23772] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2017] [Revised: 12/14/2017] [Accepted: 12/15/2017] [Indexed: 12/18/2022]
Affiliation(s)
- Jonathan M. G. Perry
- Center for Functional Anatomy and Evolution; The Johns Hopkins University School of Medicine; Baltimore Maryland
| | - Kristen A. Prufrock
- Center for Functional Anatomy and Evolution; The Johns Hopkins University School of Medicine; Baltimore Maryland
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ORSBON COURTNEYP, GIDMARK NICHOLASJ, ROSS CALLUMF. Dynamic Musculoskeletal Functional Morphology: Integrating diceCT and XROMM. Anat Rec (Hoboken) 2018; 301:378-406. [PMID: 29330951 PMCID: PMC5786282 DOI: 10.1002/ar.23714] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2017] [Revised: 09/05/2017] [Accepted: 09/11/2017] [Indexed: 12/31/2022]
Abstract
The tradeoff between force and velocity in skeletal muscle is a fundamental constraint on vertebrate musculoskeletal design (form:function relationships). Understanding how and why different lineages address this biomechanical problem is an important goal of vertebrate musculoskeletal functional morphology. Our ability to answer questions about the different solutions to this tradeoff has been significantly improved by recent advances in techniques for quantifying musculoskeletal morphology and movement. Herein, we have three objectives: (1) review the morphological and physiological parameters that affect muscle function and how these parameters interact; (2) discuss the necessity of integrating morphological and physiological lines of evidence to understand muscle function and the new, high resolution imaging technologies that do so; and (3) present a method that integrates high spatiotemporal resolution motion capture (XROMM, including its corollary fluoromicrometry), high resolution soft tissue imaging (diceCT), and electromyography to study musculoskeletal dynamics in vivo. The method is demonstrated using a case study of in vivo primate hyolingual biomechanics during chewing and swallowing. A sensitivity analysis demonstrates that small deviations in reconstructed hyoid muscle attachment site location introduce an average error of 13.2% to in vivo muscle kinematics. The observed hyoid and muscle kinematics suggest that hyoid elevation is produced by multiple muscles and that fascicle rotation and tendon strain decouple fascicle strain from hyoid movement and whole muscle length. Lastly, we highlight current limitations of these techniques, some of which will likely soon be overcome through methodological improvements, and some of which are inherent. Anat Rec, 301:378-406, 2018. © 2018 Wiley Periodicals, Inc.
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Affiliation(s)
- COURTNEY P. ORSBON
- Department of Organismal Biology and Anatomy, The University of Chicago, Chicago, Illinois 60637
| | | | - CALLUM F. ROSS
- Department of Organismal Biology and Anatomy, The University of Chicago, Chicago, Illinois 60637
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Hartstone‐Rose A, Deutsch AR, Leischner CL, Pastor F. Dietary Correlates of Primate Masticatory Muscle Fiber Architecture. Anat Rec (Hoboken) 2018; 301:311-324. [DOI: 10.1002/ar.23715] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2017] [Revised: 09/12/2017] [Accepted: 09/28/2017] [Indexed: 11/08/2022]
Affiliation(s)
- Adam Hartstone‐Rose
- College of SciencesNorth Carolina State University, 2601 Katharine Stinson Drive, 3211 Broughton Hall, Campus Box 8201Raleigh North Carolina
| | - Ashley R. Deutsch
- Department of Cell Biology and AnatomyUniversity of South Carolina School of Medicine, 6439 Garners Ferry Road, Building 1 CBA rm C‐35Columbia South Carolina
| | - Carissa L. Leischner
- Department of Cell Biology and AnatomyUniversity of South Carolina School of Medicine, 6439 Garners Ferry Road, Building 1 CBA rm C‐35Columbia South Carolina
| | - Francisco Pastor
- Departamento de Anatomía y RadiologíaUniversidad de Valladolid, Museo Anatómico, Departamento de Anatomía Humana, Calle Ramón y Cajal 7Valladolid 47005 Spain
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Taylor AB, Terhune CE, Toler M, Holmes M, Ross CF, Vinyard CJ. Jaw‐Muscle Fiber Architecture and Leverage in the Hard‐Object Feeding Sooty Mangabey are not Structured to Facilitate Relatively Large Bite Forces Compared to Other Papionins. Anat Rec (Hoboken) 2018; 301:325-342. [DOI: 10.1002/ar.23718] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2017] [Revised: 07/25/2017] [Accepted: 08/29/2017] [Indexed: 11/06/2022]
Affiliation(s)
- Andrea B. Taylor
- Department of Basic ScienceCollege of Osteopathic Medicine, Touro UniversityVallejo California
| | - Claire E. Terhune
- Department of AnthropologyUniversity of ArkansasFayetteville Arkansas
| | - Maxx Toler
- School of Osteopathic MedicineCampbell UniversityLillington North Carolina
| | - Megan Holmes
- Community and Family MedicineDuke University School of MedicineDurham North Carolina
| | - Callum F. Ross
- Organismal Biology & Anatomy, University of ChicagoChicago Illinois
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Perry JMG. Inferring the Diets of Extinct Giant Lemurs from Osteological Correlates of Muscle Dimensions. Anat Rec (Hoboken) 2018; 301:343-362. [DOI: 10.1002/ar.23719] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2017] [Revised: 08/01/2017] [Accepted: 08/24/2017] [Indexed: 11/08/2022]
Affiliation(s)
- Jonathan M. G. Perry
- Center for Functional Anatomy and Evolution; The Johns Hopkins University School of Medicine; Baltimore Maryland
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Panagiotopoulou O, Iriarte-Diaz J, Wilshin S, Dechow PC, Taylor AB, Mehari Abraha H, Aljunid SF, Ross CF. In vivo bone strain and finite element modeling of a rhesus macaque mandible during mastication. ZOOLOGY 2017; 124:13-29. [PMID: 29037463 DOI: 10.1016/j.zool.2017.08.010] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2016] [Revised: 08/25/2017] [Accepted: 08/25/2017] [Indexed: 12/29/2022]
Abstract
Finite element analysis (FEA) is a commonly used tool in musculoskeletal biomechanics and vertebrate paleontology. The accuracy and precision of finite element models (FEMs) are reliant on accurate data on bone geometry, muscle forces, boundary conditions and tissue material properties. Simplified modeling assumptions, due to lack of in vivo experimental data on material properties and muscle activation patterns, may introduce analytical errors in analyses where quantitative accuracy is critical for obtaining rigorous results. A subject-specific FEM of a rhesus macaque mandible was constructed, loaded and validated using in vivo data from the same animal. In developing the model, we assessed the impact on model behavior of variation in (i) material properties of the mandibular trabecular bone tissue and teeth; (ii) constraints at the temporomandibular joint and bite point; and (iii) the timing of the muscle activity used to estimate the external forces acting on the model. The best match between the FEA simulation and the in vivo experimental data resulted from modeling the trabecular tissue with an isotropic and homogeneous Young's modulus and Poisson's value of 10GPa and 0.3, respectively; constraining translations along X,Y, Z axes in the chewing (left) side temporomandibular joint, the premolars and the m1; constraining the balancing (right) side temporomandibular joint in the anterior-posterior and superior-inferior axes, and using the muscle force estimated at time of maximum strain magnitude in the lower lateral gauge. The relative strain magnitudes in this model were similar to those recorded in vivo for all strain locations. More detailed analyses of mandibular strain patterns during the power stroke at different times in the chewing cycle are needed.
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Affiliation(s)
- Olga Panagiotopoulou
- Moving Morphology & Functional Mechanics Laboratory, School of Biomedical Sciences, The University of Queensland, St Lucia, Brisbane, QLD 4072, Australia; Department of Anatomy and Developmental Biology, School of Biomedical Sciences, Faculty of Medicine, Nursing and Health Sciences, Monash University, Clayton, Melbourne, Victoria 3800, Australia
| | - José Iriarte-Diaz
- Department of Oral Biology, University of Illinois, 801 S. Paulina St., Chicago, IL 60612, USA
| | - Simon Wilshin
- Department of Biomedical Sciences, The Royal Veterinary College, Hawkshead Lane, North Mymms, Hatfield, Hertfordshire AL9 7TA, United Kingdom
| | - Paul C Dechow
- Department of Biomedical Sciences, College of Dentistry, Texas A&M University, 3302 Gaston Ave., Dallas, TX 75246, USA
| | - Andrea B Taylor
- Department of Basic Science, Touro University, 1310 Club Drive, Mare Island, Vellejo, CA 94592, USA
| | - Hyab Mehari Abraha
- Moving Morphology & Functional Mechanics Laboratory, School of Biomedical Sciences, The University of Queensland, St Lucia, Brisbane, QLD 4072, Australia
| | - Sharifah F Aljunid
- Materialise Unit 5-01, Menara OBYU, No. 4, Jalan PJU 8/8A, Damansara Perdana, 47820 Petaling Jaya, Selangor, Malaysia
| | - Callum F Ross
- Department of Organismal Biology and Anatomy, University of Chicago, 1027 E. 57th St., Chicago, IL 60637, USA.
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Wang Q, Dechow PC. Divided Zygomatic Bone in Primates With Implications of Skull Morphology and Biomechanics. Anat Rec (Hoboken) 2016; 299:1801-1829. [DOI: 10.1002/ar.23448] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2016] [Revised: 04/12/2016] [Accepted: 04/15/2016] [Indexed: 01/06/2023]
Affiliation(s)
- Qian Wang
- Department of Biomedical Sciences Texas A&M University College of Dentistry; Dallas Texas
| | - Paul C. Dechow
- Department of Biomedical Sciences Texas A&M University College of Dentistry; Dallas Texas
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Ross CF, Iriarte-Diaz J, Reed DA, Stewart TA, Taylor AB. In vivo bone strain in the mandibular corpus of Sapajus during a range of oral food processing behaviors. J Hum Evol 2016; 98:36-65. [DOI: 10.1016/j.jhevol.2016.06.004] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2014] [Revised: 05/11/2016] [Accepted: 06/25/2016] [Indexed: 10/21/2022]
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Growing up tough: Comparing the effects of food toughness on juvenile feeding in Sapajus libidinosus and Trachypithecus phayrei crepusculus. J Hum Evol 2016; 98:76-89. [PMID: 27544691 DOI: 10.1016/j.jhevol.2016.07.004] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2014] [Revised: 06/17/2016] [Accepted: 07/19/2016] [Indexed: 10/21/2022]
Abstract
Studies of primate feeding ontogeny provide equivocal support for reduced juvenile proficiency. When immatures exhibit decreased feeding competency, these differences are attributed to a spectrum of experience- and strength-related constraints and are often linked to qualitative assessments of food difficulty. However, few have investigated age-related differences in feeding ability relative to mechanical property variation across the diet, both within and among food types. In this study, we combined dietary toughness and feeding behavior data collected in the wild from cross-sectional samples of two primate taxa, Sapajus libidinosus and Trachypithecus phayrei crepusculus, to test the prediction that small-bodied juveniles are less efficient at processing tough foods than adults. We defined feeding efficiency as the time spent to ingest and masticate one food item (item bout length) and quantified the toughness and size of foods processed during those feeding bouts. To make the datasets comparable, we limited the dataset to foods processed by more than one age class and opened without tools. The overall toughness of foods processed by both species overlapped considerably, and juveniles and adults in both taxa processed foods of comparable toughness. Feeding efficiency decreased in response to increasing food toughness in leaf monkeys and in response to food size in both taxa. Age was found to be a significant predictor of bout length in leaf monkeys, but not in bearded capuchins. Juvenile S. libidinosus processed smaller fruits than adults, suggesting they employ behavioral strategies to mitigate the effect of consuming large (and occasionally large and tough) foods. We suggest future intra- and interspecific research of juvenile feeding competency utilize intake rates scaled by food size and geometry, as well as by detailed measures of feeding time (e.g., ingestion vs. mastication), in addition to food mechanical properties to facilitate comparisons across diverse food types and feeding behaviors.
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Young JW, Heard-Booth AN. Grasping primate development: Ontogeny of intrinsic hand and foot proportions in capuchin monkeys (Cebus albifronsandSapajus apella). AMERICAN JOURNAL OF PHYSICAL ANTHROPOLOGY 2016; 161:104-15. [DOI: 10.1002/ajpa.23013] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/25/2016] [Revised: 05/02/2016] [Accepted: 05/03/2016] [Indexed: 11/10/2022]
Affiliation(s)
- Jesse W. Young
- Department of Anatomy and Neurobiology; Northeast Ohio Medical University (NEOMED); Rootstown Ohio 44272
- Musculoskeletal Biology Research Focus Area, NEOMED; Rootstown Ohio 44272
- School of Biomedical Sciences; Kent State University; Kent Ohio 44240
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50
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Berthaume MA. Food mechanical properties and dietary ecology. AMERICAN JOURNAL OF PHYSICAL ANTHROPOLOGY 2016; 159:S79-104. [DOI: 10.1002/ajpa.22903] [Citation(s) in RCA: 51] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/18/2015] [Revised: 08/28/2015] [Accepted: 10/21/2015] [Indexed: 11/12/2022]
Affiliation(s)
- Michael A. Berthaume
- Max Planck Weizmann Center for Integrative Archaeology and Anthropology, Max Planck Institute for Evolutionary Anthropology; Deutscher Platz 6 Leipzig 04103 Germany
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