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GI Tract Layers

24.2--Layers of the GI Tract

TermDefinition
Mucosa Mucous; Deepest Layer. Epithelium, Lamina Propria, Muscularis Mucosae
Mucosa--Epithelium Function: Protection, Secretion, and Absorption
Mucosa--Lamina Propria Areolar Connective Tissue; Contains Blood and Lymphatic Vessels. Supports mucosa and binds to muscularis mucosa. Has nodules
MALT Mucosa Associated Lymphatic Tissue; Immune Response. All of GI tract, especially in tonsils, small intestine, appendix, large intestine
Mucosa--Muscularis Mucosae Causes mucous membrane of stomach and small intestine to form many small folds (for surface area).
Submucosa Meshwork of Collagenous Fibers, Nerves, and Blood Vessels. Connective tissue that binds mucosa to muscularis. Highly vascular, contains Submucosal Plexus
Submucosal Plexus Control Enteric Nervous System (ANS of gut). Sensory and motor neurons, regulates movements of mucosa and vasoconstrictions, and secretions of GI tract
Muscularis Skeletal Muscle: Mouth, pharynx, and middle esophagus -- voluntary swallowing; Anal Sphincter -- defacation Smooth Muscle: Inner circular fibers and outer longitudinal fibers--Involuntary contractions for digestion, mixing, and propulsion
Myenteric Plexus Vasomotor to Muscularis. Tract mobility and strength
Serosa Serous Membrane of Connective Tissue and simple Squamous; Visceral Peritoneum; Has serous fluid for immne protection and lubrication. Not in Esophagus
Nonkeratinized Stratified Squamous In Mouth, Pharynx, Esophagus, and Anal Canal -- Protective Function
Simple Columnar In Stomach and Intestines -- Secretion and Absorption
Connective Tissue Lamina Propria, Submucosa, Serosa
Created by: 100000434525601
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