Preganglionic fibers of the parasympathetic division of the autonomic nervous system leave the CNS at the level of the brain and sacral portions of the spinal cord.

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Preganglionic fibers of the parasympathetic division of the autonomic nervous system leave the CNS at the level of the brainstem (cranial nerves III, VII, IX, X) and the sacral portions of the spinal cord (S2-S4).

Preganglionic Fibers of the Parasympathetic Division of the Autonomic Nervous