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In vertebrates, the term motor neuron (or motoneuron) classically applies to neurons located in the central nervous system (CNS) that project their axons outside the CNS and directly or indirectly control muscles. Motor neuron is often synonymous with efferent neuron, primary neuron, or alpha motor neuron. According to their targets, motoneurons are classified into three broad categories In other words It could be argued that, in the command of visceral muscles, the ganglionic neuron — parasympathetic or sympathetic — is the real “motoneuron”, being the one that directly innervates the muscle (whereas the “general visceral motoneuron” is, strictly speaking, a “preganglionic” neuron). But, for historical reasons, the term motoneuron is reserved for the CNS neuron.
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