Alpha motor neurons innervate extrafusal fibers, the highly contracting fibers that supply the muscle with its power. Gamma motor neurons innervate intrafusal fibers, which contract only slightly.
Alpha motor neurons innervate extrafusal muscle fibers and gamma motor neurons innervate intrafusal muscle fibers. Axons that convey information from motor areas of the cerebral cortex to the spinal cord.
A gamma motor neuron (γ motor neuron), also called gamma motoneuron is a type of lower motor neuron that takes part in the process of muscle contraction, and represents about 30% of (Aγ) fibers going to the muscle. The gamma motor neurons in the ventral horn of the spinal cord send motor axons to each intrafusal muscle fiber and stimulate contraction of their polar ends.
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