Ultrastructural study of motor endings on long chain intrafusal fibers in muscle spindles of the cat.

Abstract:

:Five complete poles of long nuclear chain intrafusal fibers of cat tenuissimus muscle spindles embedded in a plastic medium were cut in serial, 1 micron thick transverse sections and stained with toluidine blue. Each fiber pole displayed one plate-type motor ending positioned outside the encapsulated part of the spindle. Ultrastructurally, the endings resembled extrafusal end-plates and were more complex, in terms of prominence of sole-plate and degree of post-junctional folding, than any other motor ending present in the spindles. They were identified as the terminals of static (fast) skeletofusimotor axons, which preferentially innervate the longest nuclear chain fibers of cat spindles.

journal_name

Brain Res

journal_title

Brain research

authors

Kucera J,Hughes R

doi

10.1016/0006-8993(83)91024-7

subject

Has Abstract

pub_date

1983-03-07 00:00:00

pages

309-13

issue

2

eissn

0006-8993

issn

1872-6240

pii

0006-8993(83)91024-7

journal_volume

262

pub_type

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