gamma motor neurones -->
gamma loop
medical dictionary

The reflex arc consisting of small anterior horn cells and neuroma, their small fibres projecting to the intrafusal bundle producing its contraction, which initiates the afferent impulses that pass through the posterior root to the anterior horn cells, inducing a stretch reflex.

Synonyms: gamma motor neurones, gamma motor system, Granit's loop.

(05 Mar 2000)