Anatomy and Cell Biology 2221 Lecture Notes - Lecture 13: Superior Mesenteric Vein, Motility, Skeletal Muscle
25 Jul 2020
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Absorb water, electrolytes from chyme to produce feces: teniae coli: 3 strips of muscularis externa, cause intestine to pucker called haustra, haustra: sacs of intestines, epiploic appendages: fall pouches (function unknown) Ileocecal valve: sphincter stops reflux of feces into ileum. Cecum appendix ascending, transverse, descending, sigmoid colon rectum anal. Sigmoid colon: very motile, connect descending to rectum. 2 flexures: right colic (hepatic) flexure, left colic (splenic) flexure. Goblet cells: abundant, screte mucus to ease passage feces thin except at teniae coli. Diverticulosis: formation of diverticula (sacs), small herniation of mucosa wall. Frequent in sigmond: diet lacks fiber reduce fecal volume circular muscle exert great pressure. Ulcerative colitis: inflame bowel disease (large intestine: abnormal immune response to bac antigens. Rectum: promote defecation: contains 3 transverse rectal folds that aid continence and prevent feces from being passed along (gas) Superior to pectinate line: visceral sensory nerve, insensitive to pain, continuous blood supply with gi tract.
