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Journal of Electron Microscopy Advance Access originally published online on February 15, 2007
Journal of Electron Microscopy 2006 55(6):301-304; doi:10.1093/jmicro/dfl040
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© The Author 2007. Published by Oxford University Press on behalf of Japanese Society of Microscopy. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org

The sensory region of muscle spindles in the posterior cricoarytenoid muscle of the marmoset

Junzo Desaki1,* and Naoya Nishida2

1 Department of Integrated Basic Medical Research Toon, Ehime 791-0295 Japan
2 Department of Otolaryngology, Ehime University School of Medicine Toon, Ehime 791-0295 Japan

*To whom correspondence should be addressed. E-mail: desaki{at}m.ehime-u.ac.jp

We examined muscle spindles in the posterior cricoarytenoid (PCA) muscle of the marmoset. The spindle capsule contained only one intrafusal muscle fiber which did not form a typical aggregation of equatorial nuclei such as bags and chains. The intrafusal fiber was innervated by sensory endings which branched and arranged irregularly. These sensory endings lay on the surface of the fiber in shallow grooves or deeply penetrated into it. These findings suggest that the muscle spindles in the marmoset PCA muscle are strikingly different in the structure of intrafusal fibers in the arrangement of sensory endings from those in common mammalian skeletal muscles.

Keywords     muscle spindle, intrafusal muscle fiber, sensory ending, posterior cricoarytenoid muscle, marmoset

Received     12 December 2006, accepted 12 December 2006


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J. Desaki and N. Nishida
A novel nerve bundle containing thin muscle fibers in the posterior cricoarytenoid muscle of the marmoset
J. Electron Microsc. (Tokyo), April 1, 2007; 56(2): 63 - 67.
[Abstract] [Full Text] [PDF]


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