The Parasympathetic Division

The Parasympathetic Division - The Parasympathetic Division...

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The Parasympathetic Division Parasympathetic division • Preganglionic neurons in the brainstem and sacral segments of spinal cord • Ganglionic neurons in peripheral ganglia located within or near target organs Organization and anatomy of the parasympathetic division • Preganglionic fibers leave the brain as cranial nerves III, VI, IX, X • Sacral neurons form the pelvic nerves Parasympathetic activation • Effects produced by the parasympathetic division • relaxation • food processing • energy absorption Neurotransmitters and parasympathetic functions • All parasympathetic fibers release ACh • Short-lived response as ACH is broken down by AChE and tissue cholinesterase • Postsynaptic membranes have two kinds of receptors • Muscarinic • Nicotinic Interactions Between the Sympathetic and Parasympathetic Divisions Sympathetic and parasympathetic divisions • Sympathetic • Widespread influence on visceral and somatic structures
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The Parasympathetic Division - The Parasympathetic Division...

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