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Journal of Electron Microscopy Advance Access published online on February 15, 2007
Journal of Electron Microscopy, 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
Received December 12, 2006
Accepted December 12, 2006

Biological: Letter

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

Junzo Desaki 1 * and Naoya Nishida 2

1 Department of Integrated Basic Medical Research, Ehime University School of Medicine, 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.
Junzo Desaki, E-mail: desaki{at}m.ehime-u.ac.jp


  Abstract

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.
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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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