PSL301H1 Lecture Notes - Lecture 37: Esophagus, Submucous Plexus, Vagus Nerve

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1 Apr 2020
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Psl301 lecture 37: control and disorders/diseases part 1. Vagus nerve to ens release of acetylcholine. Driven by stretch receptors to ens release of acetylcholine. Stretch receptors, chemoreceptors, and osmoreceptors activate ens and enteric hormones. Going to slow stuff down, materials need to be digested and absorbed. Driven by seeing, smelling, tasting, or thinking about food. Unconditioned salivary response secretory reflex initiated by presence of food in mouth mechanic receptors from chemoreceptors, relay up in the medulla signals salivation. Conditioned response sight of food becomes associated with the taste of food information from cerebral cortex relay to salivary center through conditioned reflex feed forward response (cephalic phase) Cephalic phase starts when food enters and stops at deglutition. Tongue pushes bolus against soft palate triggering swallowing reflex. Upper esophageal sphincter relaxes while epiglottis closes. Oral phase voluntary phase which moves food into oropharynx. Pharyngeal phase involuntary phase; peristalsis through upper esophageal sphincter.

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