Intrafusal muscle fibers
A)are found in muscle spindles.
B)are innervated by alpha motor neurons.
C)generate most of the tension in a skeletal muscle.
D)fire continuously at a constant rate.
E)are only found in extensor muscles.

Question

Quizplus · Accepted Answer

Intrafusal muscle fibers are a specialized type of muscle fiber that are found within muscle spindles, which are sensory organs embedded within muscle tissue. They are innervated by gamma motor neurons, which regulate their sensitivity to stretch and thus play a role in the stretch reflex. Intrafusal fibers do not generate much tension themselves, but rather serve to detect changes in muscle length and relay this information to the central nervous system.

Intrafusal Muscle Fibers