Divisions - Divisions There are three divisions of the...

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Divisions There are three divisions of the autonomic nervous system: enteric, sympathetic, and parasympathetic. The enteric nervous system is contained wholly within the organs of the digestive system and is composed of 100s of millions of neurons found in the walls of the digestive tract. It regulates the motility of viscera and the secretion of digestive enzymes and acid in concert with the ANS. Thus, the brain can impact the enteric nervous system, but it is capable of regulating itself without input. The other two divisions of the ANS are the sympathetic and parasympathetic nervous systems. These systems innervate the same target organs and may have cooperative or contrasting effects (see below). A phenomenon known as autonomic tone is the normal rate of activity that results from the balance of stimulation by the two systems. The sympathetic division prepares the body for physical activity while the parasympathetic division has a calming effect on many body functions and assists in bodily maintenance
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Divisions - Divisions There are three divisions of the...

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