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muscle spindle

Cell Biology. a proprioceptor in skeletal muscle, composed of striated muscle fibers and sensory nerve endings in a connective tissue sheath, that conveys information via the spinal nerves on the state of muscle stretch, important in the reflex mechanism that maintains body posture.
Origin of muscle spindle
1890-95 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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muscle-spindle in Medicine

muscle spindle n.
A stretch receptor found in vertebrate muscle.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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