muscle spindle

synonym: neuromuscular spindle
https://doi.org/10.1351/goldbook.11894
Sensory organ in the body of a striated muscle containing afferent and efferentnerve fibers that detect passive muscle stretch and convey information to the central nervous system to cause reflex resistance to this stretch.
Source:
PAC, 2015, 87, 841. (IUPAC Glossary of terms used in neurotoxicology (IUPAC Recommendations 2015)) on page 884 [Terms] [Paper]