Anatomy and Cell Biology 3319 Lecture Notes - Lecture 42: Taenia Coli, Muscular Layer, Ileocecal Valve
6 May 2019
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Lecture #42 march 12th, 2019: large intestine & defecation, blood supply to intestines, abdominopelvic cavity, peritoneum, and mesenteries. Absorbs water and electrolytes from chyme to produce semi-solid feces. Feces propelled thru large intestine by mass peristaltic mvmts a few times a day. 3 longitudinal strips spaced equally around large intestine. Thickenings of longitudinal layer of muscularis externa. Causes intestine to pucker into sacs called haustra: haustra. Large intestine overview: cecum, appendix, colon, ascending colon, transverse colon, descending colon, sigmoid colon, rectum, anal canal. In bottom r corner of abdomen: receives contents from ileum. Ileocecal valve sphincter which stops reflux of feces back into ileum. Can repopulate gut after diarrhea flushes out gut flora: lots of lymphoid tissue. Results from: a blockage that traps infectious-bacteria in the lumen of the appendix: blockage caused by feces, or by pathogen (virus)-induced swelling of lymphoid tissue in appendix walls. Ischemic necrosis & infection rupture: colon.
