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Chapter 19- Autonomic Nervous System
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Autonomic Nervous System is made up of
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Autonomic sensory neurons, integrating centers, autonomic motor neurons, and the enteric divison
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bekahproctor
Terms in this set (23)
Autonomic Nervous System is made up of
Autonomic sensory neurons, integrating centers, autonomic motor neurons, and the enteric divison
Preganglionic neuron
First of the neurons in any pathway; continues to the cell body
Where are the cell bodies of sympathetic preganglionic neurons located?
lateral horns of the gray matter in the 12 thoracic segments and the first two or three lumbar segments of the spinal cord
White ramus
short pathway the preganglionic sympathetic axons pass through
White rami communicantes
collection of white ramus
Axon collaterals from the sympathetic trunk terminate and synapse
1. In the first ganglion at the level of entry
2. Form sympathetic chains
3. Form splanchnic nerves
Postganglionic neurons arise from sympathetic trunk ganglia and do one of the following:
1. Return via gray communicating rami to the anterior ramus of spinal nerve
2. Exit into nerve branches that supply the heart
3. Exit the trunk in nerves that enter plexuses that follow blood vessels in that region
Four major prevertebral ganglia
Celiac, Superior mesenteric ganglion, inferior mesenteric ganglion, and aorticorenal ganglion
Where are the cell bodies of preganglionic neurons of the parasympathetic division located?
Nuclei of four cranial nerves in the brain stem and in the lateral gray horns of the second through fourth sacral segments of the spinal cord
Terminal ganglia in the head
Ciliary, pterygopalantine, submandibular, and otic
