Phys-Test-2

Phys-Test-2 - TEST 2 IV. Peripheral Nervous System A)...

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TEST 2 IV. Peripheral Nervous System A) Cranial Nerves B) Spinal Nerves C) Comparison of Spinal (somatic) and Autonomic (visceral) Reflexes 1)   D) General Organization of ANS pathway Spinal Autonomic Stimuli Musc, tendons, skin Light, sound, chemicals Changes: blood chem.,  pressure in organs, body  temp Neurons Somatic afferent  (sensory), interneuron  [maybe], somatic efferent  (motor) Visceral afferent  (sensory) 1 st  visceral  efferent (motor) 2 nd  visceral efferent (motor) Effectors Skeletal muscle Heart, lung, kidneys, b.p.,  intestines, etc.
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TEST 2 E) ANS (autonomic nervous system)- part of PNS, not under voluntary  control 1) Divisions (motor components only) (a) Sympathetic NS- associated anatomically with thoracic/lumbar  region of spinal cord (b) Parasympathetic NS- associated anatomically with cranial and  sacral regions of the spinal cord (cranio-sacral) 2) Structure of Sympathetic Pathway (a) Axon of 1 st  visceral efferent (preganglionic) neuron exits spinal cord  and goes to: (i) a sympathetic chain ganglia and synapses with a 2 nd  visceral  efferent neuron (next to spinal cord) … or … (ii) continues to a collateral ganglion and synapses with 2 nd  visceral  efferent neuron (b) axon of 2 nd  visceral efferent (postganglionic) neuron: (i) exits a ganglion and enters an autonomic nerve that innervates  a visceral effector (c) Generalization: 1 st  visceral efferent axon is relatively short in length  and carries AP to a sympathetic chain  or collateral ganglion; 2 nd  visceral effector axon is relatively long in length and carries AP  from sympathetic ganglion to visceral effector 3) Parasympathetic Pathway- no chain ganglia (a) Cranial region (i) 1 st  visceral effector axon passes over some cranial nerves (III,  VII, IX, and X) and extends to a parasympathetic ganglion near  a visceral effector
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TEST 2 (ii) 1 st  visceral effector synapses with 2 nd  visceral effector in a  parasympathetic ganglion (iii) 2 nd  visceral effector axon innervates a visceral effector (b) Sacral region (i) 1 st  VE exits lumbar region of spinal cord and passes over pelvic  nerve to parasympathetic ganglion close to a visceral effector (ii) 1 st  VE axon synapses with 2 nd  VE axon in a parasympathetic  ganglion (iii) 2 nd  VE axon extends to and innervates VE (iv) Generalization: 1 st  VE axon is relatively long in length and 2 nd  is  shorter because ganglion is next to innervated organs ***applies  to cranial and sacral pathways*** (v) General autonomic principles a Autonomic reflexes tend to restore homeostasis very quickly b Dual autonomic innervation- receives supply from both para  and symp nervous systems c Single autonomic innervation- one or the other
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This note was uploaded on 04/15/2008 for the course BIOL 20214 taught by Professor Barcellona during the Spring '08 term at TCU.

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Phys-Test-2 - TEST 2 IV. Peripheral Nervous System A)...

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