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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.
In order for skeletal muscle cells (muscle fibers) to contract, it is imperative they have communication with a motor neuron. A motor neuron is a nerve cell whose cell body is located in the spinal cord or brain. The axon of the nerve cell meanders toward the muscle it supplies. As it reaches the muscle, it branches: each branch going to a muscle fiber. The motor neuron, its axon branches, and all the muscle fibers it supplies is known as a motor unit and each muscle consists of numerous motor units (See Figure 1).