Intrafusal_muscle_fiber
Intrafusal muscle fiber
Skeletal muscle fibers
Intrafusal muscle fibers are skeletal muscle fibers that serve as specialized sensory organs (proprioceptors).[1][2] They detect the amount and rate of change in length of a muscle.[1] They constitute the muscle spindle,[2] and are innervated by both sensory (afferent) and motor (efferent) fibers.[3]
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Intrafusal muscle fibers are not to be confused with extrafusal muscle fibers, which contract, generating skeletal movement and are innervated by alpha motor neurons.[4]