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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.
Both posterior and anterior gray columns are sites where sensory and motor cell bodies, respectively, are found. Ventral root: Bundle of somatic motor fibers (axons of somatic motor neurons) and preganglionic fibers (axons of autonomic motor neurons). Constitute the efferent outflow of the spinal cord. Anterior median fissure: About 3 mm deep. Contains blood vessels (anterior spinal artery) supplying the anterior two thirds of the cord. Anterior lateral sulcus: Site of exit of ventral root.