Journal Article

Fine structural study of the innervation of muscle spindles in the internal oblique muscle of the abdominal wall in the adult mouse

Junzo Desaki, Taichi Ezaki and Naoya Nishida

in Microscopy

Published on behalf of The Japanese Society of Microscopy

Volume 59, issue 3, pages 243-250
Published in print June 2010 | ISSN: 2050-5698
Published online November 2009 | e-ISSN: 2050-5701 | DOI: http://dx.doi.org/10.1093/jmicro/dfp058
Fine structural study of the innervation of muscle spindles in the internal oblique muscle of the abdominal wall in the adult mouse

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We examined by electron microscopy the innervation of muscle spindles in the internal oblique muscle of the mouse abdominal wall. In the equatorial region, in addition to the sensory innervation on individual intrafusal muscle fibers, sensory cross terminals were often observed between nuclear chain fibers. In the area from the juxtaequatorial region to the polar region, nuclear bag fibers were supplied by trail and plate-type motor endings, while nuclear chain fibers were innervated by sensory endings, being probably secondary sensory endings. From these findings, it is clear that the innervation patterns differ between two types of intrafusal muscle fibers.

Keywords: muscle spindle; intrafusal muscle fiber; sensory ending; motor ending; internal oblique muscle; mouse

Journal Article.  2978 words.  Illustrated.

Subjects: Biological Sciences

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