Item #4 of 10

Gamma motor neurons ______________________.

are the source of innervation for intrafusal muscle fibers;
are involved in the stretch reflex;
receive input from the muscle spindle sensory fibers;
have cell bodies located in the ventral horn of spinal cord;
all of the alternatives provided are correct;

CORRECT - Yes, gamma motor neurons innervate intrafusal muscle fibers, completing the reflex that occurs in response to the stretching of muscle spindles. Gamma motor neurons cause contraction of the intrafusal fibers in response to stimulation by the muscle spindle sensory fibers. The cell bodies of gamma motor neurons are located in the ventral horn of spinal cord.

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