Extrafusal muscle fibers that surround a muscle spindle and resist excessive muscle stretching are innervated by
A) primary sensory endings.
B) secondary sensory endings.
C) α efferent neurons.
D) γ efferent neurons.

Question

Quizplus · Accepted Answer

Extrafusal muscle fibers, which are responsible for the contraction of muscles and resist excessive stretching, are innervated by α (alpha) efferent neurons. These neurons carry motor signals from the central nervous system to the muscles, causing them to contract.

Extrafusal Muscle Fibers That Surround a Muscle Spindle and Resist