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

Buying Guide

Our Reviews team has selected the best resistance bands.

Learn More About muscle spindle

Time Traveler for muscle spindle

Time Traveler

The first known use of muscle spindle was in 1894

See more words from the same year

Dictionary Entries Near muscle spindle

Muscle Shoals

muscle spindle

muscly

See More Nearby Entries 

Statistics for muscle spindle

Cite this Entry

“Muscle spindle.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/muscle%20spindle. Accessed 1 Oct. 2022.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon

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

WORD OF THE DAY

Test Your Vocabulary

The Great British Vocabulary Quiz

  • union jack speech bubble
  • Named after Sir Robert Peel, what are British police called?
How Strong Is Your Vocabulary?

Test your vocabulary with our 10-question quiz!

TAKE THE QUIZ
Universal Daily Crossword

A daily challenge for crossword fanatics.

TAKE THE QUIZ
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!