muscle spindle
noun
: a sensory end organ in a muscle that is sensitive to stretch in the muscle, consists of small striated muscle fibers richly supplied with nerve fibers, and is enclosed in a connective tissue sheath
called also stretch receptor
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“Muscle spindle.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/muscle%20spindle. Accessed 25 Nov. 2024.
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