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18 Cards in this Set
- Front
- Back
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Antagonistic Actions
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most common
opposite effects on the same organ one division usually exhibits dominant effects |
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vasomotor tone
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SYMPATHETIC controls blood pressure even at rest by partially constricting blood vessels
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vagal tone
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PARASYMPATHETIC effects dominate the heart
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Cooperative effects example
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parasympathetic causes erection and sympathetic causes ejaculation
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What is effected ONLY by sympathetic? (4)
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adrenal medulla
sweat glands and errector pili muscles kidneys - release of renin most blood vessels (except erection) |
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Parasympathetic
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short-lived, localized control of effectors
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Sympathetic
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longer-lasting, more widespread effects
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What type of neuron is ALWAYS in the ANS?
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a two-neuron motor chain
preganglionic neuron ganglionic neuron |
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Preganglionic neuron
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extends from CNS to ganglionic neuron
part of 4 CNs half of 31 pairs of spinal nerves cell bodies in lateral horns |
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Ganglionic
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cell body is in autonomic ganglion
postganglionic axon extends to effector |
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Parasympathetic (craniosacral)
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preganglionic neurons originate from brain and sacral regions and are very LONG
ganglionic neurons are SHORT |
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terminal ganglion
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the synapse of 2 parasympathetic neurons in or near effector organ
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How much of parasympathetic outflow is via Vagus (X) nerve?
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90%
serves visceral plexuses |
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Sympathetic (thoracolumbar)
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preganglionic neurons originate from thoracic and upper lumbar regions (T1 - L2)
ganglionic neuron is long |
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Where does the synapse between pre and ganglionic neurons occur?
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sympathetic chain ganglia or collateral ganglia
close to spinal cord |
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Sympathetic Chain Ganglia
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AKA paravertebral ganglion
lie near or on either side of spinal cord |
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Collateral Ganglia
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AKA prevertebral ganglion
located on or near the abdominal aorta |
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celiac (solar) plexus
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preganglionic neurons and associated ganglia form several nerve plexuses on the surface of the aorta
SYMPATHETIC |
