Duodenojejunal flexure

Last revised by Dr Yair Glick on 09 Sep 2021

The duodenojejunal (DJ) flexure or junction is the anatomical border between the duodenum and the jejunum.

The duodenojejunal flexure is located anterolateral to the aorta at the level of the upper border of the second lumbar vertebra. It makes a sharp turn anteroinferiorly to become the jejunum.

The duodenojejunal flexure is suspended from the ligament of Treitz, which serves as its surgical landmark and gives it its unique shape. It also marks the small bowel's transition from the retroperitoneum, which invests the duodenum, into the peritoneal cavity.

  • venous anatomy not well characterized
  • veins accompany arteries of corresponding names and may drain directly into the superior mesenteric vein
  • sympathetic: periarterial plexuses on the branches of the celiac artery and superior mesenteric artery

  • parasympathetic: vagal fibers from the celiac plexus synapse on neurons in the duodenal wall

For uncommon variant anatomy of the duodenojejunal flexure, see

ADVERTISEMENT: Supporters see fewer/no ads

Cases and figures

  • Case 1: Normal position of the DJ flexure
    Drag here to reorder.
  • Updating… Please wait.

     Unable to process the form. Check for errors and try again.

     Thank you for updating your details.