Duodenum Four parts Superior part-1 ◆ Duodenal cap. Superior duodenal flexure Descending part-2 LOngitudinal fold of duodenum Major duodenal papilla ◆ Minor duodenal papilla Inferior duodenal flexure Horizontal part. -3 Ascending part-4 duodenojejunal flexureFour parts Superior part -1 Duodenal cap. Superior duodednal flexure. Descending part -2 Longitudinal fold of duodenum. Major duodenal papilla. Minor duodenal papilla. Inferior duodenal flexure. Horizontal part.-3 Ascending part-4. duodenojejunal flexure. Duodenum 2 1 4 3