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TONOMURA S, EBARA S, BAGDASARIAN K, UTA D, AHISSAR E, MEIR I, LAMPL I, KURODA D, FURUTA T, FURUE H, KUMAMOTO K. Structure-function correlations of rat trigeminal primary neurons: Emphasis on club-like endings, a vibrissal mechanoreceptor. Proc Jpn Acad Ser B Phys Biol Sci 2015; 91:560-76. [PMID: 26666306 PMCID: PMC4773582 DOI: 10.2183/pjab.91.560] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
This study focuses on the structure and function of the primary sensory neurons that innervate vibrissal follicles in the rat. Both the peripheral and central terminations, as well as their firing properties were identified using intracellular labelling and recording in trigeminal ganglia in vivo. Fifty-one labelled neurons terminating peripherally, as club-like, Merkel, lanceolate, reticular or spiny endings were identified by their morphology. All neurons responded robustly to air puff stimulation applied to the vibrissal skin. Neurons with club-like endings responded with the highest firing rates; their peripheral processes rarely branched between the cell body and their terminal tips. The central branches of these neurons displayed abundant collaterals terminating within all trigeminal nuclei. Analyses of three-dimensional reconstructions reveal a palisade arrangement of club-like endings bound to the ringwulst by collagen fibers. Our morphological findings suggest that neurons with club-like endings sense mechanical aspects related to the movement of the ringwulst and convey this information to all trigeminal nuclei in the brainstem.
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Affiliation(s)
- Sotatsu TONOMURA
- Department of Anatomy, Meiji University of Integrative Medicine, Nantan, Kyoto, Japan
| | - Satomi EBARA
- Department of Anatomy, Meiji University of Integrative Medicine, Nantan, Kyoto, Japan
- Correspondence should be addressed: S. Ebara, Department of Anatomy, Meiji University of Integrative Medicine, Honoda, Hiyoshi-cho, Nantan 629-0392, Japan (e-mail: )
| | - Knarik BAGDASARIAN
- Department of Neurobiology, Weizmann Institute of Science, Rehovot, Israel
| | - Daisuke UTA
- Department of Information Physiology, National Institute for Physiological Sciences, Okazaki, Aichi, Japan
- Department of Applied Pharmacology, Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama, Toyama, Japan
| | - Ehud AHISSAR
- Department of Neurobiology, Weizmann Institute of Science, Rehovot, Israel
| | - Inbal MEIR
- Department of Neurobiology, Weizmann Institute of Science, Rehovot, Israel
| | - Ilan LAMPL
- Department of Neurobiology, Weizmann Institute of Science, Rehovot, Israel
| | - Daichi KURODA
- Department of Anatomy, Meiji University of Integrative Medicine, Nantan, Kyoto, Japan
| | - Takahiro FURUTA
- Department of Morphological Brain Science, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Hidemasa FURUE
- Department of Information Physiology, National Institute for Physiological Sciences, Okazaki, Aichi, Japan
| | - Kenzo KUMAMOTO
- Department of Anatomy, Meiji University of Integrative Medicine, Nantan, Kyoto, Japan
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