During a stretch reflex,the extrafusal motor neuron is excited directly by the
A) intrafusal motor neuron.
B) muscle spindle receptor.
C) spindle afferent neuron.
D) intrafusal muscle.
E) muscle.

Question

Quizplus · Accepted Answer

The spindle afferent neuron, which is activated by the stretch of the muscle spindle, directly excites the extrafusal motor neuron during a stretch reflex. This is part of the monosynaptic reflex arc that facilitates the contraction of the stretched muscle.

During a Stretch Reflex,the Extrafusal Motor Neuron Is Excited Directly