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those neurons which regulate the contraction of smooth and cardiac muscle and the secretion of glands, by way of the general visceral efferent component of cranial and spinal nerves; contains two divisions, parasympathetic and sympathetic which provide double innervation to most organs by way of a two-neuron chain, the first neuron has its cell of origin in the brain or spinal cord and the second in an autonomic ganglion.
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