Histochemical study of an unusual cat intrafusal muscle fiber |
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Authors: | J. Kucera |
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Affiliation: | (1) Department of Neurology, School of Medicine, Boston University, 80 East Concord Street, 02118 Boston, MA, USA |
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Abstract: | Summary A cat tenuissimus muscle spindle that contained two long chain intrafusal fibers in its distal pole is described. One of the fibers (1 c1) had a histochemical profile (ATPase, NADH-TR, ChE reactions) of the kind which is characteristic for long chain fibers. The other fiber (1 c2) consisted of two separate segments. The inner 1 c2 segment included the sensory equatorial region and was histochemically normal. The outer 1 c2 segment carried a motor plate, and did not stain for NADH-TR in the same way as the inner 1 c2 segment and the 1 c1 fiber. It is suggested that the unusual enzyme staining properties of the outer 1 c2 segment stemmed from its lack of sensory innervation, a situation which may have permitted the full expression of influences mediated by its motor nerve supply. |
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