Parasympathetic Nervous System

Neurons in the brainstem and the sacral region of the spinal cord give rise to preganglionic parasympathetic fibers. Fibers from nuclei in the brainstem travel via the oculomotor (III), facial (VII), glossopharyngeal (IX), and vagus (X) nerves. Postganglionic fibers arise from neurons (ganglia) derived from neural crest cells and pass to the structures they innervate (e.g., pupil of the eye, salivary glands, viscera).

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