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| aka involuntary nervous system; subdivision of the motor portion of the PNS that regulates body activities that are generally not under conscious control |
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| composed of a special group of motor neurons serving the smooth muscle, cardiac muscle, and glands |
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| The motor pathways of the ANS differ from those of the SNS because it consists of _____. |
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Definition
| chains of two motor neurons, the preganglionic and postganglionic |
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Definition
| the first visceral motor neuron of each pair, resides in the brain stem or lateral horn of the spinal cord, and its axon leaves the CNS to synapse with the postganglionic neuron |
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| visceral motor neuron in peripheral ganglia whose cell body is located in a ganglion outside the CNS, and its axon extends to the organ it serves |
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| aka craniosacral; preganglionic neurons are located in brain stem nuclei of cranial nerves III, VII, IX, and X and in S2-S4 of the spinal cord; long preganglionic fibers and short post |
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Definition
| aka intramural ganglion; where parasympathetic preganglionic and postganglionic fibers synapse |
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| parasympathetic postganglionic fibers that release ACh |
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| sympathetic postganglionic fibers that release norepinephrine |
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| aka thoracolumbar division; preganglionic neurons located in the lateral horns of gray matter of spinal cord from T1-L2; short preganglionic and long post |
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| The sympathetic fibers are different lengths only in _____. |
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Definition
| low blood pressure when up due to the sympathetic nervous system not being able to react to the gravity of standing up quickly enough; causing dizziness, light headedness, and syncope |
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Term
| ANS motor neurons of the CNS synapse on |
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Definition
| visceral motor neurons in autonomic ganglia, and these ganglionic neurons control visceral effectors |
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Term
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Definition
| ganglia of the ANS that contain hundreds to thousands of ganglionic neurons; innervate visceral effectors such as cardiac muscle, smooth muscle, glands, and adipose tissue |
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