Autonomic and Somatic Divisions of the NS

Autonomic and - Autonomic and Somatic Divisions of the NS Objectives To be able to compare parasympathetic vs sympathetic neurons To understand the

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BMED 3100 Autonomic and Somatic Divisions of the NS Objectives: • To be able to compare parasympathetic vs. sympathetic neurons • To understand the relationship between the autonomic nervous system and homeostasis • To be able to compare neurotransmitter release in autonomic neurons vs. somatic neurons
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BMED 3100 Efferent Peripheral Nervous System Autonomic (involuntary) Sympathetic : fight or flight Parasympathetic: rest and digest – Together they help maintain homeostasis – Often work as antagonistic control branches Somatic (voluntary)
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BMED 3100 M o t o r n e u r o n Preganglionic neuron Postganglionic neuron
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BMED 3100 Parasympathetic vs. Sympathetic Sympathetic action increased heart rate blood vessels in muscles in arms, legs, and heart dilate liver produces glucose digestion slows (blood diverted from GI tract) pupils dilate bronchioles dilate catacholamine secretion by adrenal medulla inhibits insulin secretion Parasympathetic action slows heart rate to normal resting state digestion increases to normal bronchioles constrict to normal pupils constrict to normal insulin secretion increases to normal
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BMED 3100 Sympathetic and Parasympathetic Pathways Parasympathetic: blue Sympathetic: red Note: the two pathways originate from different locations the ganglion location are different (s – close to spinal cord, ps – by target organs) effector organs are innervated by both parasympathetic and sympathetic nerves
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BMED 3100 Sympathetic and Parasympathetic Pathways
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BMED 3100 All autonomic pathways consist of 2 neurons in series: a. Preganglionic neuron
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This note was uploaded on 01/12/2012 for the course BMED 3110 taught by Professor Staff during the Spring '08 term at Georgia Institute of Technology.

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Autonomic and - Autonomic and Somatic Divisions of the NS Objectives To be able to compare parasympathetic vs sympathetic neurons To understand the

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