DUodenum Four parts Superior part a Duodenal cap Descending part Major duodenal papilla Horizontal pal art ve@ Ascending part a duodenojejunal flexure十二指肠空肠曲 Suspensory muscle of duodenum十二指肠悬 肌( ligament of Treitz)Duodenum Four parts ◼ Superior part ❑ Duodenal cap ◼ Descending part Major duodenal papilla ◼ Horizontal part ◼ Ascending part ❑ duodenojejunal flexure 十二指肠空肠曲 ❑ Suspensory muscle of duodenum十二指肠悬 肌 (ligament of Treitz)