duodenojejunal flexure
{{short description|Border between the duodenum and the jejunum}}
{{Infobox anatomy
| Name = Duodenojejunal flexure
| Latin = flexura duodenojejunalis
| Image = Gray1041.png
| Caption = Superior and inferior duodenal fossæ.
| Image2 = Illu small intestine.jpg
| Caption2 = Small intestine
| System =
}}
The duodenojejunal flexure or duodenojejunal junction, also known as the angle of Treitz,Bracale, Umberto et.al. [https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7889543/#:~:text=The%20angle%20of%20Treitz%20(AT,first%2010%20cm%20of%20jejunum. Laparoscopic segmental resection for tumours of the Angle of Treitz: a challenging but feasible surgical option. Results from a retrospective case-series analysis]. Updates Surg. 2021; 73(1): 179–186. {{doi| 10.1007/s13304-020-00910-7}}Lissauer et.al. [https://books.google.com/books?id=gQbQDwAAQBAJ Neonatology at a Glance]. John Wiley & Sons, 2020, p.125. is the border between the duodenum and the jejunum.
Structure
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.{{Citation|title=Small Intestine|date=2017-01-01|url=http://www.sciencedirect.com/science/article/pii/B9780323477819500313|work=Imaging Anatomy: Chest, Abdomen, Pelvis (Second Edition)|pages=636–665|editor-last=Federle|editor-first=Michael P.|publisher=Elsevier|doi=10.1016/B978-0-323-47781-9.50031-3 |language=en|isbn=978-0-323-47781-9|access-date=2021-01-26|editor2-last=Rosado-de-Christenson|editor2-first=Melissa L.|editor3-last=Raman|editor3-first=Siva P.|editor4-last=Carter|editor4-first=Brett W.|url-access=subscription}} The duodenojejunal flexure is surrounded by the suspensory muscle of the duodenum.{{cite book|last=Drake|first=Richard L.|title=Gray's anatomy for students|year=2005|publisher=Elsevier/Churchill Livingstone|location=Philadelphia|isbn=978-0-8089-2306-0|author2=Vogl, Wayne |author3=Tibbitts, Adam W.M. Mitchell |author4=illustrations by Richard |author5= Richardson, Paul }}{{rp|274}} It is retroperitoneal, so is less mobile than the jejunum that comes after it, helping to stabilise the jejunum.{{Citation|last1=Schneider|first1=Armin|title=Chapter 2 - Anatomy, Physiology, and Selected Pathologies of the Gastrointestinal Tract|date=2017-01-01|url=http://www.sciencedirect.com/science/article/pii/B9780128032305000026|work=Biomedical Engineering in Gastrointestinal Surgery|pages=11–39|editor-last=Schneider|editor-first=Armin|publisher=Academic Press|language=en|isbn=978-0-12-803230-5|access-date=2021-01-26|last2=Feussner|first2=Hubertus|editor2-last=Feussner|editor2-first=Hubertus}}
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.Jacob, S. (2007) Chapter 4: Abdomen; Human anatomy, A clinically-orientated approach.{{rp|85}}
Additional images
See also
{{Anatomy-terms}}
References
{{Gray's}}
{{Reflist}}
External links
- {{SUNYAnatomyFigs|37|06|04}} - "The large intestine."
- {{SUNYAnatomyLabs|39|07|01|05}} - "Intestines and Pancreas: The Duodenum"
- {{SUNYAnatomyImage|8|1|55}}
{{Digestive tract}}
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