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15 Cards in this Set
- Front
- Back
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Autonomic NS innervates...
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Involuntary muscle: smooth muscle, cardiac muscle, glands
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Autonomic NS AKA
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Visceral NS or "hollow organs"
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Sympathetic NS AKA
Pre-ganglionic nerves originate... |
Thoracolumbar division
In gray matter of spinal cord segments T1-L2 |
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Parasympathetic NS AKA
Preganglionic nerves originate... |
Craniosacral division
Pre-ganglionic nerves in brainstem and gray matter of spinal cord S2-S4 |
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Both parasympathetic and sympathetic utilize...
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Two neuron system to innervate viscera
Pre-ganglionic neuron --> synapse at ganglion --> post-ganglionic neuron innervates muscle or gland |
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Sympathetic division responses
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Fight or flight
Catabolic (energy expending) Dilate pupils Increase cardiac output Innervate smooth muscle around blood vessels Innervate sweat glands Innervate arrector pili (goose bumps) |
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Sympathetic effectors are found...
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Throughout entire body
(Parasympathetic are not found in limbs or skin) |
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Parasympathetic effectors are not found...
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In skin or limbs (so head and trunk only)
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Parasympathetic responses
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Anabolic (energy conserving)
Promotes rest and digest Decrease heart rate Constrict pupils Increase GI motility Also a two-neuron system |
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Cell bodies of pre-ganglionic sympathetic neurons found...
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In lateral horns of the spinal cord gray matter between T1 and L2
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Cell bodies of post-ganglionic sympathetic neurons found...
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1. In paravertebral ganglia (sympathetic chain)
OR 2. Prevertebral ganglia - ganglia located along aorta in the abdomen (ex. celiac and mesenteric ganglia) |
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Sympathetic chain extends from....
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Superior cervical ganglia at base of skull to
Ganglion impar inferiorly (near coccyx) *Only sympathetic division |
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Sympathetic chains connect to... via...
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Spinal nerves (ventral rami) via rami communicans throughout length of vertebral column
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Visceral motor neurons (efferent) pathway
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Exit spinal cord (cell body in lateral horn) via ventral root and enter spinal nerve
Now enter sympathetic chain via white ramus communicans, synapse, and exit via gray ramus communicans Either exit immediately or ascend or descend (synapse occurs at level where exit, so after ascending or descending) Where they can then travel to the back/skin of the back via dorsal ramus or to the rest of the body via ventral ramus |
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Visceral sensory nerves...
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Convey info back to CNS concerning status of viscera
One-neuron system Cell bodies found in DRG Enter spinal cord via dorsal root --> dorsal horn Enter at closest spinal cord level; do not ascend or descend |
