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peripheral motor neuron. Etymology: Gk, periphereia + L, motor, mover; Gk, neuron, nerve. an effector neuron located outside the central nervous system, usually in a ganglion of the sympathetic or parasympathetic nervous system.
Lower motor neurons. Neurons with their cell bodies in the spinal cord or brainstem whose axons directly innervate skeletal muscle fibers. The two types are (1) alpha motor neurons innervate extrafusal muscle fibers and (2) gamma motor neurons innervate intrafusal muscle fibers.ower motor neurons. Neurons with their cell bodies in the spinal cord or brainstem whose axons directly innervate skeletal muscle fibers. The two types are (1) alpha motor neurons innervate extrafusal muscle fibers and (2) gamma motor neurons innervate intrafusal muscle fibers.