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muscle spindle

noun

Definition of muscle spindle

: 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

First Known Use of muscle spindle

1894, in the meaning defined above

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More Definitions for muscle spindle

muscle spindle

noun

Medical Definition of muscle spindle

: 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

More from Merriam-Webster on muscle spindle

Britannica.com: Encyclopedia article about muscle spindle

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