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205textnotes19 - Chap 11-The Peripheral Nervous System has...

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Chap. 11 --------------------------------------------------------------------- The Peripheral Nervous System has TWO DIVISIONS: 1. AUTONOMIC 2. SOMATIC A.1. The autonomic nervous system: is regulated by the brain (Fig. 11-3) the MOTOR SYSTEM for the VISCERA, SMOOTH MUSCLES, and EXOCRINE GLANDS. It consists of 3 subdivisions: 1. sympathetic nervous system: The sympathetic nervous system participates in the response of the body to stress. It governs FIGHT and FLIGHT REACTIONS (Fig. 11-1) . 2. parasympathetic nervous system: The parasympathetic nervous system acts to conserve the body resources and restores homeostasis. It is responsible for REST and DIGEST (Fig. 11-1) . 3. enteric nervous system: The enteric nervous system controls the function of the smooth muscles of the gut. It plays a major role in homeostasis. It controls gastrointestinal blood vessel tone, motility, gastric secretion and fluid transport. Extrinsic nerves from the sympathetic and parasympathetic systems regulate it.
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