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Minelli L, van der Lei B, Mendelson BC. The Deep Fascia of the Head and Neck Revisited: Relationship with the Facial Nerve and Implications for Rhytidectomy. Plast Reconstr Surg 2024; 153:1273-1288. [PMID: 37036327 PMCID: PMC11104498 DOI: 10.1097/prs.0000000000010556] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2022] [Accepted: 03/31/2023] [Indexed: 04/11/2023]
Abstract
BACKGROUND The deep fascia is important in face-lift surgery, as it is relied on for protection of the facial nerve during surgical dissection. Lack of consistency with the term may be attributable to the term deep fascia having two different meanings. It is a specific type of connective tissue, classically thin, fibrous, and flat, whereas in the description of the layers of the face and neck, the deep fascia layer includes all the connective tissue deep to the superficial fascia layer. This cadaver study was undertaken to clarify the layered anatomy of the face and neck and its relationship with the facial nerve branches. METHODS Preliminary dissections and macrosectioning, followed by a conclusive series of standardized layered dissections, histologic analysis, and sheet plastination, were performed on 50 cadaver heads. RESULTS The deep fascia is thin in convex areas of the face and neck, and thicker in concave areas; it is interspersed with deep fat. The facial nerve branches, after emerging from the parotid gland, are embedded within the deep fascia, not deep to it. They transition from deep within the deep fascia at specific locations to course in the most superficial part of the deep fascia where they underlie their target superficial fascia muscles and are at risk from deep plane face-lift dissection. CONCLUSIONS The deep fascia layer is a multilamellar fibrofatty layer of variable thickness, which includes the deep fat in which the facial nerve branches are embedded. In deep plane face-lift surgery, dissection must be performed in the most superficial level of this deep fascia layer.
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Affiliation(s)
- Lennert Minelli
- From the Mendelson Advanced Facial Anatomy Course, Australasian Society of Aesthetic Plastic Surgeons
- Medical Engineering Research Facility, Queensland University of Technology
- Department of Anatomy and Physiology, School of Biomedical Sciences, The University of Melbourne
- Department of Plastic Surgery, University Medical Centre Groningen, University of Groningen
| | - Berend van der Lei
- Department of Plastic Surgery, University Medical Centre Groningen, University of Groningen
| | - Bryan C. Mendelson
- From the Mendelson Advanced Facial Anatomy Course, Australasian Society of Aesthetic Plastic Surgeons
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Dahl KH, Nielsen MBM, Alkjær T, Vitger AD, Miles JE. Muscle function assessment of the hindlimbs in healthy dogs using acoustic myography. Res Vet Sci 2024; 168:105135. [PMID: 38194891 DOI: 10.1016/j.rvsc.2024.105135] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2023] [Revised: 12/20/2023] [Accepted: 01/01/2024] [Indexed: 01/11/2024]
Abstract
INTRODUCTION Impaired muscle function is a frequent consequence of musculoskeletal disorders in dogs. Musculoskeletal disorders, especially stifle joint diseases, are common in dogs and assessment of muscle function in dogs is clinically relevant. Acoustic myography (AMG) is a non-invasive method to assess muscle activity. Quantifying muscle function in normal dogs could help identify clinically relevant changes in dogs with orthopaedic disease and allow targeted interventions to improve recovery in these. The objectives of the study were to characterize hindlimb muscle function in healthy dogs using AMG and to investigate the repeatability and reproducibility of AMG in dogs. METHODS Healthy dogs (15-40 kg) without musculoskeletal disorders were recruited and screened for eligibility to participate in the study. The muscle activity in four hindlimb muscles related to the stifle was assessed using AMG. The degree of symmetry between the hindlimbs in these dogs was investigated and the reliability of AMG was evaluated. RESULTS AND CONCLUSIONS The study population comprised 21 dogs. Reference intervals and symmetry indices for AMG scores of the hindlimb muscles were identified, with highest variability for the E-scores. For all AMG-scores, same-day variation was lower than between days variation, and both were lowest for S- and T-scores. Further investigation is needed to establish if AMG can enable discrimination between dogs with altered muscle function and healthy dogs.
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Affiliation(s)
- Kathrine Højte Dahl
- Department of Veterinary Clinical Sciences, University of Copenhagen, Dyrlægevej 16, 1870 Frederiksberg C, Denmark.
| | | | - Tine Alkjær
- Department of Biomedical Sciences, University of Copenhagen, Blegdamsvej 3, 2200 Copenhagen, N, Denmark; The Parker Institute, Bispebjerg-Frederiksberg Hospital, Nordre Fasanvej 57, 2000 Frederiksberg, Denmark.
| | - Anne Désiré Vitger
- Department of Veterinary Clinical Sciences, University of Copenhagen, Dyrlægevej 16, 1870 Frederiksberg C, Denmark.
| | - James Edward Miles
- Department of Veterinary Clinical Sciences, University of Copenhagen, Dyrlægevej 16, 1870 Frederiksberg C, Denmark.
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Nešporová K, Matonohová J, Husby J, Toropitsyn E, Stupecká LD, Husby A, Suchánková Kleplová T, Streďanská A, Šimek M, Nečas D, Vrbka M, Schleip R, Velebný V. Injecting hyaluronan in the thoracolumbar fascia: A model study. Int J Biol Macromol 2023; 253:126879. [PMID: 37709215 DOI: 10.1016/j.ijbiomac.2023.126879] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2023] [Revised: 08/30/2023] [Accepted: 09/10/2023] [Indexed: 09/16/2023]
Abstract
Hyaluronan (HA) has been recently identified as a key component of the densification of thoracolumbar fascia (TLF), a potential contributor to non-specific lower back pain (LBP) currently treated with manual therapy and systemic or local delivery of anti-inflammatory drugs. The aim of this study was to establish a novel animal model suitable for studying ultrasound-guided intrafascial injection prepared from HA with low and high Mw. Effects of these preparations on the profibrotic switch and mechanical properties of TLF were measured by qPCR and rheology, respectively, while their lubricating properties were evaluated by tribology. Rabbit proved to be a suitable model of TLF physiology due to its manageable size enabling both TLF extraction and in situ intrafascial injection. Surprisingly, the tribology showed that low Mw HA was a better lubricant than the high Mw HA. It was also better suited for intrafascial injection due to its lower injection force and ability to freely spread between TLF layers. No profibrotic effects of either HA preparation in the TLF were observed. The intrafascial application of HA with lower MW into the TLF appears to be a promising way how to increase the gliding of the fascial layers and target the myofascial LBP.
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Affiliation(s)
| | - Jana Matonohová
- Contipro a.s., Dolní Dobrouč 401, 561 02 Dolní Dobrouč, Czech Republic
| | - Jarmila Husby
- Contipro a.s., Dolní Dobrouč 401, 561 02 Dolní Dobrouč, Czech Republic
| | | | | | - Aaron Husby
- Contipro a.s., Dolní Dobrouč 401, 561 02 Dolní Dobrouč, Czech Republic
| | - Tereza Suchánková Kleplová
- Department of Dentistry, Charles University, Faculty of Medicine in Hradec Kralove and University Hospital Hradec Kralove, 500 05 Hradec Kralové, Czech Republic
| | - Alexandra Streďanská
- Biotribology Research Group, Faculty of Mechanical Engineering, Brno University of Technology, 616 69 Brno, Czech Republic
| | - Matěj Šimek
- Contipro a.s., Dolní Dobrouč 401, 561 02 Dolní Dobrouč, Czech Republic
| | - David Nečas
- Biotribology Research Group, Faculty of Mechanical Engineering, Brno University of Technology, 616 69 Brno, Czech Republic
| | - Martin Vrbka
- Biotribology Research Group, Faculty of Mechanical Engineering, Brno University of Technology, 616 69 Brno, Czech Republic
| | - Robert Schleip
- DIPLOMA Hochschule, 37242 Bad Sooden-Allendorf, Germany; Conservative and Rehabilitative Orthopedics, Department of Sport and Health Sciences, Technical University of Munich, 80333 Munich, Germany
| | - Vladimír Velebný
- Contipro a.s., Dolní Dobrouč 401, 561 02 Dolní Dobrouč, Czech Republic
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Corsato Alvarenga I, Gustafson D, Banks K, Wilson K, McGrath S. Cannabidiol plasma determination and pharmacokinetics conducted at beginning, middle and end of long-term supplementation of a broad-spectrum hemp oil to healthy adult dogs. Front Vet Sci 2023; 10:1279926. [PMID: 37841465 PMCID: PMC10571049 DOI: 10.3389/fvets.2023.1279926] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2023] [Accepted: 09/12/2023] [Indexed: 10/17/2023] Open
Abstract
Introduction Veterinary hemp products containing cannabidiol (CBD) and negligible psychoactive (THC) have increased popularity since hemp (with <0.3% THC) was removed from schedule 1 substances under the Controlled Substances Act in 2018. This was accompanied by increased CBD research, mostly on the short-term safety and efficacy for inflammatory and neurological conditions. It is imperative to understand how CBD is metabolized or accumulated in the body long-term, thus the goal of the present work was to determine monthly plasma CBD concentrations, as well as changes in pharmacokinetic (PK) parameters in chronically dosed dogs. Methods The study was a masked, placebo-controlled, randomized design. Six adult beagles were assigned to placebo, 5 and 10 mg/kg/day CBD treatment groups. Dogs received oral oil treatment once daily for 36 weeks. Blood was collected once every 4 weeks pre- and postprandially for CBD plasma determination (at 0 and 2 h). Pharmacokinetics were conducted at 0, 18 and 36 weeks. Pharmacokinetics and monthly CBD plasma data of dogs who received CBD were analyzed as repeated measures over time using a mixed model, with significance at α = 0.05. Results Average plasma CBD at 5 and 10 mg/kg were 97.3 ng/mL and 236.8 ng/mL pre-prandial, 341 ng/mL and 1,068 ng/mL postprandial, respectively. PK parameters suggested CBD accumulation over time, with significant increases in Cmax and AUC at both the 18 and 36-week timepoints. Cmax and AUC were dose proportional. Half-life demonstrated large inter-individual variations and increased (p < 0.05) at weeks 18 and 36 compared to baseline. Volume of distribution was not affected by time or treatment, while MRT increased, and clearance decreased over time (p < 0.05). Conclusions and clinical importance Chronic administration of CBD to healthy adult dogs led to a dose-proportional accumulation in the body for 36 weeks, which was confirmed by an increased half-life, total exposure, mean residence time and plasma peak. Our data also suggests that CBD plasma levels may have less daily variation if administered twice daily.
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Affiliation(s)
- Isabella Corsato Alvarenga
- Department of Clinical Sciences, College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Fort Collins, CO, United States
| | - Daniel Gustafson
- Department of Clinical Sciences, College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Fort Collins, CO, United States
| | - Krista Banks
- Department of Clinical Sciences, College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Fort Collins, CO, United States
| | - Kim Wilson
- Hill’s Pet Nutrition, Topeka, KS, United States
| | - Stephanie McGrath
- Department of Clinical Sciences, College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Fort Collins, CO, United States
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Lossi L. Anatomical features for an adequate choice of the experimental animal model in biomedicine: III. Ferret, goat, sheep, and horse. Ann Anat 2022; 244:151978. [PMID: 35787443 DOI: 10.1016/j.aanat.2022.151978] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2022] [Revised: 06/08/2022] [Accepted: 06/09/2022] [Indexed: 11/17/2022]
Abstract
The anatomical characteristics of each of the many species today employed in biomedical research are very important when selecting the correct animal model(s), especially for conducting translational research. In previous papers, these features have been considered for fish (D'Angelo et al. Ann. Anat, 2016, 205:75), the most common laboratory rodents, rabbits, and pigs (Lossi et al. 2016). I here follow this line of discussion by dealing with the importance of proper knowledge of ferrets, goats, sheep, and horses' main anatomical features in translational research.
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Affiliation(s)
- Laura Lossi
- University of Turin, Department of Veterinary Sciences, Turin, Italy; INN, Istituto Nazionale di Neuroscienze, Turin, Italy.
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Meuten DJ, Moore FM, Donovan TA, Bertram CA, Klopfleisch R, Foster RA, Smedley RC, Dark MJ, Milovancev M, Stromberg P, Williams BH, Aubreville M, Avallone G, Bolfa P, Cullen J, Dennis MM, Goldschmidt M, Luong R, Miller AD, Miller MA, Munday JS, Roccabianca P, Salas EN, Schulman FY, Laufer-Amorim R, Asakawa MG, Craig L, Dervisis N, Esplin DG, George JW, Hauck M, Kagawa Y, Kiupel M, Linder K, Meichner K, Marconato L, Oblak ML, Santos RL, Simpson RM, Tvedten H, Whitley D. International Guidelines for Veterinary Tumor Pathology: A Call to Action. Vet Pathol 2021; 58:766-794. [PMID: 34282984 DOI: 10.1177/03009858211013712] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Standardization of tumor assessment lays the foundation for validation of grading systems, permits reproducibility of oncologic studies among investigators, and increases confidence in the significance of study results. Currently, there is minimal methodological standardization for assessing tumors in veterinary medicine, with few attempts to validate published protocols and grading schemes. The current article attempts to address these shortcomings by providing standard guidelines for tumor assessment parameters and protocols for evaluating specific tumor types. More detailed information is available in the Supplemental Files, the intention of which is 2-fold: publication as part of this commentary, but more importantly, these will be available as "living documents" on a website (www.vetcancerprotocols.org), which will be updated as new information is presented in the peer-reviewed literature. Our hope is that veterinary pathologists will agree that this initiative is needed, and will contribute to and utilize this information for routine diagnostic work and oncologic studies. Journal editors and reviewers can utilize checklists to ensure publications include sufficient detail and standardized methods of tumor assessment. To maintain the relevance of the guidelines and protocols, it is critical that the information is periodically updated and revised as new studies are published and validated with the intent of providing a repository of this information. Our hope is that this initiative (a continuation of efforts published in this journal in 2011) will facilitate collaboration and reproducibility between pathologists and institutions, increase case numbers, and strengthen clinical research findings, thus ensuring continued progress in veterinary oncologic pathology and improving patient care.
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Affiliation(s)
| | | | | | - Christof A Bertram
- Freie Universität Berlin, Berlin, Germany.,University of Veterinary Medicine, Vienna, Austria
| | | | | | | | | | | | | | | | | | | | - Pompei Bolfa
- Ross University, Basseterre, Saint Kitts and Nevis
| | - John Cullen
- North Carolina State University, Raleigh, NC, USA
| | | | | | | | | | | | | | | | | | | | | | | | | | - Nick Dervisis
- VA-MD College of Veterinary Medicine, Blacksburg, VA, USA
| | | | | | | | | | | | - Keith Linder
- North Carolina State University, Raleigh, NC, USA
| | | | | | | | - Renato L Santos
- Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil
| | - R Mark Simpson
- Center for Cancer Research, National Cancer Institute, Bethesda, MD, USA
| | - Harold Tvedten
- Swedish University of Agricultural Sciences, Uppsala, Sweden
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Equine Cervical Pain and Dysfunction: Pathology, Diagnosis and Treatment. Animals (Basel) 2021; 11:ani11020422. [PMID: 33562089 PMCID: PMC7915466 DOI: 10.3390/ani11020422] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2020] [Revised: 01/25/2021] [Accepted: 02/03/2021] [Indexed: 01/14/2023] Open
Abstract
Simple Summary Neck pain and dysfunction in the horse is becoming an increasingly important topic among riders, trainers and veterinarians. Some horses may present for a subtle performance decline, while others may show dramatic, dangerous behavior. It is important to recognize how to carefully evaluate the horse in an effort to understand the different types of pain that may be contributing to the different behaviors. The musculoskeletal and nervous systems may both play a role in the development of clinical signs. Recognizing that there are many diagnostic options as well as several treatments choices is important. This synopsis covers the disease processes that may contribute to the development of neck pain and dysfunction in the horse, as well as several possible diagnostic and treatment options. Abstract Interest in the cervical spine as a cause of pain or dysfunction is increasingly becoming the focus of many equine practitioners. Many affected horses are presented for poor performance, while others will present with dramatic, sometimes dangerous behavior. Understanding and distinguishing the different types of neck pain is a starting point to comprehending how the clinical presentations can vary so greatly. There are many steps needed to systematically evaluate the various tissues of the cervical spine to determine which components are contributing to cervical pain and dysfunction. Osseous structures, soft tissues and the central and the peripheral nervous system may all play a role in these various clinical presentations. After completing the clinical evaluation, several imaging modalities may be implemented to help determine the underlying pathologic processes. There are multiple treatment options available and each must be carefully chosen for an individual horse. Provided is a synopsis of the current knowledge as to different disease processes that can result in cervical pain and dysfunction, diagnostic approaches and treatment strategies. Improving the knowledge in these areas will ideally help to return horses to a state of well-being that can be maintained over time and through the rigors of their job or athletic endeavors.
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