HTHSCI 1H06 Study Guide - Submucous Plexus, Myenteric Plexus, Stratified Squamous Epithelium
19 Mar 2014
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2: part deux: the basic plan, the peritoneum, and the stomach. Basic plan of gi tract consists of four primary layers: Nonkeratinized stratified squamous epithelium (not as tough as integument)- need stratified squamous here b/c of friction forces from food- need multiple layers so they can be sloughed off- rest of gi consists of simple cuboidal epithelium. Two muscle layers: inner circular and outer longitudinal (shortens path) Two work together to help push food from mouth to stomach. Peristalsis- causes lumen to get smaller, contraction will ride down entire length of esophagus, pushing food. Adventitia- loose connective tissue that ties the esophagus to all of the loose connective tissues in neck and plasters it to posterior thoracic wall so that esophagus does not move around much. Rest of gi tract, if sitting in abdominal-pelvic cavity, outer layer is serosa- thin layer of epithelial tissue which secretes serial fluid, allowing visceral organs to move around within cavity.
