Health Sciences 3300A/B Lecture Notes - Lecture 12: Pylorus, Duodenum, Unix System Iii

• School: Western University
• Department: Health Sciences
• Course: Health Sciences 3300A/B
• Professor: Oleksiy Zaika

Document Summary

Lecture 12 digestive system iii intestines & accessory organs. Gi tract small intestine: major digestive organ (absorption) 3 regions: duodenum (proximal, c-shaped curve after the stomach. Position: short, c-shaped, retroperitoneal, behind peritoneal wall. Shape: superior duodenal flexure, descending part, horizontal part, ascending part, duodenojejunal flexure. Openings: pyloric sphincter opening into duodenum, duodenal papilla, bump which is the end of the duct that is an accumulation of secretions from pancreas, gallbladder, and liver, secretions exit through this papilla. Duodenum blood supply: gastroduodenal branch continues inferiorly to form the. Pancreaticoduodenal branch on superior side: extends downwards towards curvature of duodenum, then curves upwards into the superior mesenteric, also supplies head and neck of pancreas. Larger lumen: tapers off as you get into ileum, more folds, more secretions. Fewer folds and secretions: more malt tissue lymphatic tissue, helps protect gi system from potential pathogens that made it past acidic environment, ends at ileocecal valve.