chp 17 - Fig. 17.1 Fig. 17.1 Sympathetic division Cell body...

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Click to edit Master subtitle style Chapter 17 Autonomic Nervous System
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What is it? ¢ Set of neurons involved in: ¢ unconscious sensory info. from viscera (e.g. chemoreceptors) ¢ involuntary inhibition or excitation of smooth & cardiac muscle or glandular secretion ¢ two neuron pathway CNS ± PNS preganglionic and postganglionic neurons
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Autonomic vs Somatic NS Ganglion (ganglia)
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¢ Preganglionic neuron l cell body in brain or spinal cord l myelinated axon that extends to a ganglion (white ramus) ¢ Postganglionic neuron l cell body ouside CNS in a ganglion l unmyelinated axon ends at a visceral effector (target)
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2 divisions of ANS ¢ Sympathetic and parasympathetic ¢ Organs innervated by both l Opposing actions (e.g.) Symp. ↑ heart rate (fight or flight) Parasymp ↓ heart rate (rest and digest)
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Fig.17.1
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Unformatted text preview: Fig. 17.1 Fig. 17.1 Sympathetic division Cell body -pregang. l Lateral gray horns of s. cord btwn. T1-T12 and L1-L2 Cell body - postgang. (synapse) l Sympathetic chain/trunk ganglia l 3 free ganglia in abdomen Fig. 17.2 Fig. 17.3 Fig. 17.3 Fig. 17.3 Fig. 17.4 Cell body -pregang. l CN III, VII, IX, X l Lateral gray horns of s. cord btwn Cell body - postgang. (synapse) l Many terminal ganglia next to or on effector Parasympathetic division Fig. 17.7 Fig. 17.8 Symp. Vs. Parasymp. Sympathetic fight or flight l heart, resp., blood flow to muscles, sweat glands, blood sugar l Dilate eyes l blood flow to parts of repro. organs, GI, urinary Parasympathetic rest and digest l Opposite effects Fig. 17.10...
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chp 17 - Fig. 17.1 Fig. 17.1 Sympathetic division Cell body...

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