PHSI2006 Study Guide - Final Guide: Prevertebral Ganglia, Enteric Nervous System, Parasympathetic Nervous System

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3/07/2016 12:37 pm is an entire nervous system, the brain in the gut- has sensory, interneurons and effector neurons so it can have its own reflexes. Huge system, 100 million neurons: neurotransmitter- some nerves can co-secrete e. g. ach, 5ht, Sympathetic: coming from thoraco-lumbar region, short preganglionic ach, long post ganglionic ne, preganglionic! ganglia! postganglionic. It has already synapsed outside of it in the pre-vertebral ganglia (celiac, superior mesenteric and inferior mesenteric). Neurotransmitter effects on enteric smooth muscle (motility effects: go: acetylcholine (ach), substance p (makes you poo, slow: enkephalins, stop: norepinephrine ne, nitric oxide, vasoactive intestinal. Peptide (vip) (no, no and vip says no). Short reflex: entirely within the wall of the gut, only enteric ns, e. g. sensory information! Ens network integrates it! initiates responses through submucosal neurons for secretion or myenteric neurons for motility. Long reflex: sensory receptors go to the spinal cord (gets integrated in the.