parasympathetic part of autonomic (visceral motor) division of peripheral nervous system
Definition: the presynaptic (preganglionic) autonomic neurons having cell bodies located in the brain, associated with the motor nuclei of certain cranial nerves [CNs III, VII, IX, and X], or in the gray matter of spinal cord segments S2–S4, and the postsynaptic neurons with which the presynaptic fibers connect (synapse); in the head, there are four discrete parasympathetic ganglia: ciliary, pterygopalatine, otic, and submandibular/sublingual; in the trunk, the postsynaptic cells occur as isolated intrinsic ganglia.
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