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I - 1 attaches mucosa to underlying muscle 2 submucosal...

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The Digestive System I. Overview of Digestive System A. Functions 1. ingestion 2. moving food along 3. digestion - breakdown of foodstuffs a. chemical - breaking chemical bonds b. mechanical - churning, breaking, tearing 4. absorption - passage from GI tract to blood 5. defecation - removal of waste from the body B. Organization 1. gastrointestinal tract (alimentary canal) GI a. mouth, pharynx, esophagus, stomach, small intestine, large intestine 2. accessory digestive structures a. teeth, tongue, salivary glands, liver, gallbladder, pancreas II. General Histology A. Overall Structure - 4 layers INSIDE mucosa l submucosa l muscularis OUTSIDE serosa (adventitia) B. Mucosa - innermost lining of digestive tract 1. epithelium - stratified in mouth, esophagus simple throughout the rest 2. lamina propria - l. connective tissue with vessels a. contains vessels to absorb nutrients from above b. lymph tissue protects against infection 3. muscularis mucosae - smooth muscle C. Submucosa - dense connective tissue
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Unformatted text preview: 1. attaches mucosa to underlying muscle 2. submucosal plexus - autonomic innervation of muscle D. Muscularis- skeletal and smooth muscle 1. mouth, pharynx, upper esophagus - skeletal muscle 2. rest of GI tract - smooth muscle a. one layer - circular around GI b. second layer - longitudinal along GI 3. myenteric plexus - autonomic fibers to smooth muscle The Digestive System E. Serosa (peritoneum) - serous membrane around GI tract 1. parietal peritoneum- lines the wall of abdomen 2. visceral peritoneum- covers most of the organs 3. peritoneal cavity- between parietal & visceral a. ascites- fluid buildup in peritoneal cavity 4. retroperitoneal- kidneys & pancreas ("behind") 5. mesentery- sheetlike peritoneum a. attaches small intestine to the wall 6. falciform ligament- attaches liver to diaphragm 7. lesser omentum- attaches stomach/duodenum to liver 8. greater omentum (fatty layer) - over intestines a. many fat cells and lymph tissue...
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I - 1 attaches mucosa to underlying muscle 2 submucosal...

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