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Journal of Electron Microscopy Advance Access published online on July 31, 2009
Journal of Electron Microscopy, doi:10.1093/jmicro/dfp038
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© The Author 2009. Published by Oxford University Press on behalf of Japanese Society of Microscopy. All rights reserved. For permissions, please e-mail: journals.permissions@oxfordjournals.org

A further observation of muscle spindles in the extensor digitorum longus muscle of the aged rat

Junzo Desaki1,* and Naoya Nishida2

1 Department of Integrated Basic Medical Research, Ehime University School of Medicine, Toon, Ehime 791-0295
2 Department of Otolaryngology, Takamatsu Red Cross Hospital, Takamatsu, Kagawa 760-0017, Japan

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

We observed three novel muscle spindles in the extensor digitorum longus muscle of the aged (20 months) rat. Two muscle spindles of the three contained thin muscle fibers lacking sensory innervation between the layers of the spindle capsule and within the periaxial space, respectively. The other one contained sensory-innervated thin muscle fibers with an indistinct equatorial nucleation between the layers of the spindle capsule. These findings suggest that the occurrence of thin muscle fibers may be intimately related to the degeneration and regeneration of extrafusal muscle fibers during aging and that these newly formed thin muscle fibers may often fail to receive sensory innervation.

Keywords     muscle spindle, intrafusal muscle fiber, thin muscle fiber, sensory ending, motor ending, aged (20 months) rat

Received      2 March 2009, accepted 7 July 2009


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