Question

Gamma motoneurons innervate intra-fusal muscle fibers to detect the amount and rate of change in length of a muscle. What is the function of gamma motoneurons?

1) To control the contraction of extra-fusal muscle fibers
2) To detect the amount and rate of change in length of a muscle
3) To regulate the blood flow to the muscle
4) To transmit sensory information from the muscle to the brain

Answer 1

Gamma motoneurons have the function of detecting the amount and rate of change in length of a muscle. They innervate intrafusal muscle fibers within muscle spindles to provide sensory information to the brain about the position of the body and the movement of muscles.

Step-by-step explanation:

Gamma motoneurons have the function of detecting the amount and rate of change in length of a muscle.

They innervate intrafusal muscle fibers, which are specialized muscle fibers found within muscle spindles. These muscle spindles are stretch receptors that detect the stretch or lengthening of muscles.

By detecting the changes in muscle length, gamma motoneurons provide sensory information to the brain about the position of the body and the movement of muscles.