Spinal motor neurons responsible for contracting muscles are known as _________ motor neurons.
A) alpha
B) beta
C) gamma
D) theta

Question

Quizplus · Accepted Answer

Alpha motor neurons are responsible for innervating extrafusal muscle fibers, which are responsible for generating force and contracting muscles. Beta motor neurons innervate intrafusal muscle fibers, which are involved in sensory feedback for muscle length and tension. Gamma motor neurons also innervate intrafusal muscle fibers, but their role is to adjust the sensitivity of the muscle spindle to changes in muscle length. Theta motor neurons do not exist.

Spinal Motor Neurons Responsible for Contracting Muscles Are Known as _________