Duodenum is the First part of Small Intestines, which can be further divided into superior, descending, horizontal and ascending parts. If you want to learn the complete anatomy of duodenum along with its blood supply, this is the right place for you. Timeline: 00:00 Introduction 01:08 Peritoneal Structures around Duodenum 04:02 Parts of Duodenum 04:25 Superior Part 05:20 Descending Part 10:26 Horizontal Part 11:32 Ascending Part 12:00 Duodenojejunal Flexure 12:20 Ligament of Treitz 14:00 Blood Supply