6visceralmotor_Octobe7_2009

6visceralmotor_Octobe7_2009 - Somatic versus Visceral...

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Somatic versus Visceral Nervous Systems Somatic (voluntary) (Quick's lecture) motor neurons are in the CNS motor neurons have very precise connections with their targets Visceral or autonomic (involuntary) motor (or effector) neurons are in the PNS effector neurons have diffuse connections Two main subdivisions that work in opposition to each other Sympathetic Parasympathetic (These are integrated with a 3rd subdivision, the enteric nervous system, that we'll get to later on)
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Fight or Flight Rest and Digest Terminology Preganglionic Output goes to the ganglia Lies within the CNS Postganglionic Output from ganglia that goes to effector (muscles, glands, organs etc.) Ganglia (clumps of cells, in this case nerve cells) Transmitters Preganglionic connections, cholinergic, via nicotinic receptors (iontropic) Postganglionic Sympathetic , noradrenergic Parasympathetic, cholinergic via muscarinic receptors –metabotrophic, mediated by G proteins No, I do not expect you to memorize every single ganglion and its target .
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Most sympathetic ganglia lie in the * paravertebral, sympathetic trunk (or chain ). Some of these ganglia have special names, like the superior cervical and stellate ganglia). Other sympathetic ganglia (the prevertebral ganglia) are tucked elsewhere. These are the celiac and the superior and inferior mesenteric ganglia . (No, you do not have to memorize the names of individual ganglia) Sympathetic *para = next to
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Fig. 1. The anatomical dissection of the rami communicantes of the thoracic sympathetic ganglia. BP, brachial plexus; SG, stellate ganglion; T2, the second sympathetic ganglion; T3, the third sympathetic ganglion; T4, the fourth sympathetic ganglion; N1, the first intercostal nerve; N2, the second intercostal nerve; N3, the third intercostal nerve; N4, the fourth intercostal nerve. Arrowheads indicate the rami communicantes.
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This note was uploaded on 04/18/2010 for the course BISC 421 at USC.

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6visceralmotor_Octobe7_2009 - Somatic versus Visceral...

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