Lecture 34 - Autonomic Nervous System: Parasympathetic...

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Autonomic Nervous System: Parasympathetic Division
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Parasympathetic Nervous System “Craniosacral” preganglionic cell bodies located in the brain stem or the sacral region of spinal cord (S2-S4) 4 cranial nerves are preganglionic neurons
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Cranial Nerves 1) Oculomotor (III) – mixed cranial nerve responsible for eye ball movement stimulates the lacrimal gland 2) Facial (VII) – mixed cranial nerve stimulates salivation 3) Glossopharyngeal (IX) – mixed cranial nerve involved in swallowing and salivation 4) Vagus (X) – mixed cranial nerve; carries 80% of parasympathetic outflow to heart, airways, liver, gallbladder, stomach, small intestine and part of large intestine
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Cranial portion 1) Preganglionic neurons found in pons or medulla 2) Information carried by 4 cranial nerves: III, VII, IX, X 3) 80% of PSNS information carried by Vagus (X) Sacral portion 1) Preganglonic neurons in sacral region (S2-S4) exit via pelvic nerves 2) Preganglionic neurons synapse with postganglionic neurons near target organs
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This note was uploaded on 03/24/2010 for the course PSIO 201 taught by Professor Stanescu during the Spring '08 term at University of Arizona- Tucson.

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Lecture 34 - Autonomic Nervous System: Parasympathetic...

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