Duodenojejunal flexure

The duodenojejunal flexure or duodenojejunal junction is the border between the duodenum and the jejunum.

Duodenojejunal flexure
Superior and inferior duodenal fossæ.
Small intestine
Latinflexura duodenojejunalis
Anatomical terminology


The ascending portion of the duodenum ascends on the left side of the aorta, as far as the level of the upper border of the second lumbar vertebra, where it turns abruptly forward to become the jejunum, forming the duodenojejunal flexure. The duodenojejunal flexure is surrounded by the suspensory muscle of the duodenum.[1] :274

It lies in front of the left Psoas major and left renal vessels, and is covered in front, and partly at the sides, by peritoneum continuous with the left portion of the mesentery.

Clinical relevance

The ligament of Treitz, a peritoneal fold, from the right crus of diaphragm, is an identification point for the duodenojejunal flexure at operation.[2]:85

Additional images

See also


This article incorporates text in the public domain from page 1170 of the 20th edition of Gray's Anatomy (1918)

  1. Drake, Richard L.; Vogl, Wayne; Tibbitts, Adam W.M. Mitchell; illustrations by Richard; Richardson, Paul (2005). Gray's anatomy for students. Philadelphia: Elsevier/Churchill Livingstone. ISBN 978-0-8089-2306-0.
  2. Jacob, S. (2007) Chapter 4: Abdomen; Human anatomy, A clinically-orientated approach.
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