BIOL-242 Lecture Notes - Lecture 43: Ileocecal Valve, Pylorus, Jejunum
10 Jun 2020
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Chapter 23 part 5 |function anatomy - the small. 2-4 m long; from pyloric sphincter to ileocecal valve. Curves around head of pancreas; shortest part 25 cm. Bile duct (from liver) and main pancreatic duct (from pancreas) Joins large intestine at ileocecal valve about 3. 6 m long. Vagus nerve (parasympathetic) and sympathetics from thoracic splanchnic nerves serve small intestine. Veins (carrying nutrient-rich blood) drain into superior mesenteric veins hepatic portal vein liver. Increase surface area of proximal part for nutrient absorption. Permanent folds (~1 cm deep) that force chyme to slowly spiral through lumen increase in more nutrient absorption. Extensions (~1 mm high) of mucosa with capillary bed and lacteal for absorption. Microvilli (brush border) // contain enzymes for carbohydrate and protein digestion. Intestinal crypt epithelium renewed every 2-4 days. Most - secretory cells that produce intestinal juice. Stem cells divide to produce crypt cells. Kills rapidly dividing gi tract epithelium nausea, vomiting, diarrhea.
