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.
Words nearby muscle spindle
Origin of muscle spindle
First recorded in 1890–95
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Medicine definitions for muscle spindle
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.