intrafusal fiber


Also found in: Medical.

intrafusal fiber

[¦in·trə′fyüz·əl ′fī·bər]
(histology)
Any of the striated muscle fibers contained in a muscle spindle.
Mentioned in ?
References in periodicals archive ?
The motoneuron plays a role in changing the length of the intrafusal fibers and adjusting sensitivity of the muscle spindles.
When intrafusal fibers contract, there is no direct contribution to muscle tension or muscle shortening.
Thus, gamma activation and contraction of intrafusal fibers can drive alpha activation and the contraction of entire muscle (Nielsen et al.