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Muscle Spindle

Middle third of a terminal plaque in the muscle spindle of an adult cat. (After Ruffini.)


The neuromuscular spindles are present in the majority of voluntary muscles, and consist of small bundles of peculiar muscular fibers (intrafusal fibers), embryonic in type, invested by capsules, within which nerve fibers, experimentally shown to be sensory in origin, terminate. These neuromuscular spindles vary in length from 0.8 mm. to 5 mm., and have a distinctly fusiform appearance. The large medullated nerve fibers passing to the end-organ are from one to three or four in number; entering the fibrous capsule, they divide several times, and, losing their medullary sheaths, ultimately end in naked axis-cylinders encircling the intrafusal fibers by flattened expansions, or irregular ovoid or rounded disks (Fig. 939). Neuromuscular spindles have not yet been demonstrated in the tongue muscles, and only a few exist in the ocular muscles. (Text modified from Gray's 1918 Anatomy)



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Reference

Gray H. Anatomy of the human body. (1918) Philadelphia: Lea & Febiger.


Cite this page: Hill, M.A. (2024, April 17) Embryology Gray0939.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Gray0939.jpg

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current08:35, 19 August 2012Thumbnail for version as of 08:35, 19 August 2012681 × 371 (90 KB)Z8600021 (talk | contribs)==Muscle Spindle== Middle third of a terminal plaque in the muscle spindle of an adult cat. (After Ruffini.) The neuromuscular spindles are present in the majority of voluntary muscles, and consist of small bundles of peculiar muscular fibers (intrafus

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