Four Layers of the GI Tract

Four Layers of the GI Tract - Digestive System Four Layers...

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Digestive System Four Layers of the GI Tract * Mucosa * Epithelium * Lamina propria * Muscularis muscosa * Submucosa * Muscularis * Internal oblique (only in the stomach) * Inner circular layer * Outer longitudinal layer * Serosa * Areolar tissue * mesothelium General Histology Mucosa * The inner layer of the tract that is a mucous membrane that is composed of a * layer of epithelium- simple columnar in most of the GI tract * Nonkeratinized stratified squamous from the oral cavity through the esophagus and in the lower anal canal (areas subject to abrasion) * Lamina propria- areolar connective tissue containg blood and lymphatic vessels * muscularis mucosae- a thin layer of smooth muscle ( is responsible for the mucosal folds, or rugae , that serves to increase the surface area for digestion. * Is the most highly differentiated layer of the GI tract. * Tissue specialization and surface shape are correlated with functional differentiation along the tract. General Histology
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This note was uploaded on 01/30/2012 for the course BSC BSC1085 taught by Professor Sharonsimpson during the Fall '10 term at Broward College.

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Four Layers of the GI Tract - Digestive System Four Layers...

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