Biology:Duodenojejunal flexure

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Short description: Border between the duodenum and the jejunum
Duodenojejunal flexure
Superior and inferior duodenal fossæ.
Illu small intestine.jpg
Small intestine
Latinflexura duodenojejunalis
Anatomical terminology

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


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. At this point, it turns abruptly forward to merge with the jejunum, forming the duodenojejunal flexure. This forms the beginning of the jejunum.[1] The duodenojejunal flexure is surrounded by the suspensory muscle of the duodenum.[2]:274 It is retroperitoneal, so is less mobile than the jejunum that comes after it, helping to stabilise the jejunum.[3]

The duodenojejunal flexure lies in front of the left psoas major muscle, the left renal artery, and the left renal vein. It is covered in front, and partly at the sides, by peritoneum continuous with the left portion of the mesentery.

Clinical significance

The ligament of Treitz, a peritoneal fold, from the right crus of diaphragm, is an identification point for the duodenojejunal flexure during abdominal surgery.[4]:85

Additional images

See also


  1. Federle, Michael P.; Rosado-de-Christenson, Melissa L.; Raman, Siva P. et al., eds. (2017-01-01), "Small Intestine" (in en), Imaging Anatomy: Chest, Abdomen, Pelvis (Second Edition) (Elsevier): pp. 636–665, ISBN 978-0-323-47781-9,, retrieved 2021-01-26 
  2. 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. 
  3. Schneider, Armin; Feussner, Hubertus (2017-01-01), Schneider, Armin; Feussner, Hubertus, eds., "Chapter 2 - Anatomy, Physiology, and Selected Pathologies of the Gastrointestinal Tract" (in en), Biomedical Engineering in Gastrointestinal Surgery (Academic Press): pp. 11–39, ISBN 978-0-12-803230-5,, retrieved 2021-01-26 
  4. Jacob, S. (2007) Chapter 4: Abdomen; Human anatomy, A clinically-orientated approach.

External links