| Duodenojejunal flexure | |
|---|---|
 Superior and inferior duodenal fossæ. | |
 Small intestine | |
| Details | |
| Identifiers | |
| Latin | flexura duodenojejunalis |
| TA98 | A05.6.02.009 |
| TA2 | 2952 |
| FMA | 15957 |
| Anatomical terminology | |
Theduodenojejunal flexure orduodenojejunal junction, also known as theangle of Treitz,[1][2] is the border between theduodenum and thejejunum.
The ascending portion of theduodenum ascends on the left side of theaorta, as far as the level of the upper border of the secondlumbar vertebra. At this point, it turns abruptly forward to merge with thejejunum, forming the duodenojejunal flexure. This forms the beginning of the jejunum.[3] The duodenojejunal flexure is surrounded by thesuspensory muscle of the duodenum.[4]: 274 It isretroperitoneal, so is less mobile than the jejunum that comes after it, helping to stabilise the jejunum.[5]
The duodenojejunal flexure lies in front of the leftpsoas major muscle, theleft renal artery, and theleft renal vein. It is covered in front, and partly at the sides, byperitoneum continuous with the left portion of themesentery.
Theligament of Treitz, a peritoneal fold, from theright crus of diaphragm, is an identification point for the duodenojejunal flexure duringabdominal surgery.[6]: 85
This article incorporates text in thepublic domain frompage 1170 of the 20th edition ofGray's Anatomy(1918)
