Pathology 3245B Lecture 7: =GI Tract - McLean
16 Feb 2017
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Small bowel: duodenum (c-shaped) jejunum ileum. Large bowel cancer (most common cancer of gi tract) Longest part of gi tract (cid:862) (cid:373)all(cid:863) (cid:271)o(cid:449)el (cid:271)/(cid:272) of the dia(cid:373)eter obstruction often occurs here. Large bowel: cecum, ascending, traverse, and descending colon, sigmoid colon, rectum, anus. Entire gi tract has muscle coat conducting peristalsis to ensure movement. Valves: esophagus - stomach; stomach-small bowel; small-large bowel prevention of back flow. Pancreas secretes digestive enzymes: absorption (bowels mainly): Bile released into duodenum; makes lipids & fats absorbable. Loss of appetite - ok: nausea - ok, vomiting. Hematemesis vomiting blood (temesis = vomiting; heme = blood) Occult (hidden; not visible to naked eye) or visible. Melena black blood in stool; stomach or duodenum acid/pepsin can change blood to dark colour. Hematochezia red blood in stool; small or large bowel; lots of blood, therefore no time to change colour. Esophagus runs midline to the back of chest runs between trachea and aorta.
