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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The first known use of muscle spindle was in 1894

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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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occurring twice a year or every two years

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