File:Gray0939.jpg

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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Pages where the terms "Historic" (textbooks, papers, people, recommendations) appear on this site, and sections within pages where this disclaimer appears, indicate that the content and scientific understanding are specific to the time of publication. This means that while some scientific descriptions are still accurate, the terminology and interpretation of the developmental mechanisms reflect the understanding at the time of original publication and those of the preceding periods, these terms, interpretations and recommendations may not reflect our current scientific understanding.     (More? Embryology History | Historic Embryology Papers)

iBook - Gray's Embryology

iTunes link | iBooks Store Description - an extract of the embryology content from Anatomy of the Human Body By Henry Gray Philadelphia: Lea & Febiger, 1918. Releases First Edition - Jan 2012 Second Edition - March 2012 Repaired formatting and image display issues related to Pad rotated display and minor editing issues. Print length 169 pages, 41.6 MB, Language English. The current website also includes numerous images from this textbook, see Anatomy of the Human Body by Henry Gray and Category:Gray's 1918 Anatomy. Note the also Historic Disclaimer.

Reference

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

Cite this page: Hill, M.A. (2024, April 27) Embryology Gray0939.jpg. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/File:Gray0939.jpg

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