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18 Cards in this Set
- Front
- Back
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Ganglion |
group of cell bodies in PNS |
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Dual innervation/antagonistic control |
parasympathetic and sympathetic fibers innervate tissues |
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pelvic splanchnic nerves |
axons of preganglionic cell bodies located in S2-S4 region that enervate pelvic organs |
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thoracolumbar division |
Sympathetic division; go from T1-L2 region of spinal cord |
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Sympathetic trunk ganglion |
sympathetic ganglion create ganglion chain in thorax |
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Collateral ganglion |
sympathetic ganlia not part of the sympathetic trunk |
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White ramus communicans |
myelinated nerve branch of sympathetic trunk that provide passage for preganglionic sympathetic fibers from anterior root |
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Gray ramus communicans |
unmyelinated postganglionic axons that enter ventral or dorsal roots through these branches |
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splanchnic nerves |
fibers at t5 and below that form synapses in collateral ganglia |
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Differences between somatic and autonomic motor pathways |
1. somatic motor pathways have one neuron connecting the CNS to PNS (lower motor neuron) 2. autonomic pathways have two neurons connecting the CNS to PNS (preganglionic and postganglionic neurons) 3. Somatic and parasympathetic motor pathways always use ACh as NT; sympathetic pathways have postganglionic neuron use NE |
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Explain how adrenal medulla works as "modified sympathetic ganglion" How is it different or similar from typical sympathetic ganglion? |
Structure that is part of the adrenal glands that act as a sympathetic ganglion because its where the axons of the preganglionic neuron terminate and send ACh to stimulate signals to target tissue. Difference: no postganglionic neuron; chromaffin cells secrete epinephrine and NE to blood vessels Similar: preganglionic neuron axon sends releases ACh in ganglion |
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Differences between parasympathetic and sympathetic divisions |
Parasympathetic: enervate visceral organs, long preganglionic fibers and short postganglionic fibers, ganglia closer to target tissues, exit from brain and sacral region of spine Sympathetic: enervate visceral organs and superficial structures, short preganglionic fibers and long postganglionic fibers, ganglia near spinal cord, exit from thoracic and lumbar spinal nerves |
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Cranial nerves and ganglia that carry parasympathetic fibers |
Oculomotor (ciliary), facial (pterygopalatine and submandibular), glossopharyngeal (otic), and vagus |
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Organs that receive info via vagus nerve |
Heart, lungs, liver, stomach, pancreas, and intestines |
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Where are sacral parasympathetic fibers and what organs do they enervate |
S2-S4 spinal nerves and genitals and large intestines |
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Where are the sympathetic preganglionic cell bodies located? |
lateral horns of thoracic and lumbar spinal cord |
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3 ways that pre and postgnalionic sympathetic neurons connec |
1. In trunk ganglion at same level 2. In trunk ganglion at different levels 3. pass through trunk to connect in collateral ganglion |
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List collateral ganglia associated with splanchnic nerves |
Greater splanchnic nerve/celiac ganglion Lesser splanchnic nerve/aorticorenal ganglion Least splanchnic nerve/superior mesenteric ganglion Lumbar splanchnic nerve/inferior mesenteric ganglion |
