Intrafusal fibers receive input from
A) alpha motor neurons.
B) gamma motor neurons.
C) Ia sensory fibers.
D) C fibers.

Question

Quizplus · Accepted Answer

Intrafusal fibers are specialized muscle fibers that are innervated by gamma motor neurons, which control their sensitivity to stretch and contraction. Alpha motor neurons, on the other hand, innervate extrafusal muscle fibers, which generate force and produce movement. Ia sensory fibers are specialized nerve fibers that detect changes in muscle length and convey this information to the spinal cord. C fibers are unmyelinated nerve fibers that transmit pain and temperature sensations.

Intrafusal Fibers Receive Input from