NEUR30003 Lecture Notes - Lecture 15: Pacemaker Potential, Internal Anal Sphincter, Somatic Nervous System
13 Aug 2020
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Document Summary
7m of gi tract - ens is 2nd largest ns in the body it is larger than ns in spinal cord. Separated chemically (and physically) into different nutrients that can be absorbed. Bi-products transported along the intestinal tract for further processing and recovery of key materials. Food that is high in salt or sugar will have important metabolic effects and neural control mechanisms, even after it passes the tongue. Somatic nervous system chewing, swallowing, peristalsis in esophagus (upper 2/3 has striated muscles) and opening key sphincters: voluntary actions. Visceral neurons involved in: salivation, secondary peristalsis, all functions from stomach to anus: supply the hollow organs. Visceral neurons include sympathetic and parasympathetic nervous systems, many visceral afferents and the enteric nervous system (intrinsic to the gut wall) Initiates the cephalic phase of digestion: salivation, gastric relaxation, gastric acid secretion, via parasympathetic ns (vagus) particularly, no food needs to be ingested, more palatable the food, the greater the response.
