Duodenojejunal flexure

Duodenojejunal flexure
Superior and inferior duodenal fossæ.
Small intestine
Details
Identifiers
Latin	flexura duodenojejunalis
TA	A05.6.02.009
FMA	15957
*Anatomical terminology* [edit on Wikidata]

The duodenojejunal flexure or duodenojejunal junction 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, 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

Duodenojejunal fossa.
Front of abdomen, showing surface markings for duodenum, pancreas, and kidneys.

References

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

↑ 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.
↑ Jacob,S. (2007) Chapter 4: Abdomen; Human anatomy, A clinically-orientated approach.

External links

Anatomy figure: 37:06-04 at Human Anatomy Online, SUNY Downstate Medical Center - "The large intestine."
Anatomy photo:39:07-0105 at the SUNY Downstate Medical Center - "Intestines and Pancreas: The Duodenum"
Anatomy image:8155 at the SUNY Downstate Medical Center

Anatomy of the Gastrointestinal tract, excluding the mouth

Upper

Pharynx	Muscles Spaces peripharyngeal retropharyngeal parapharyngeal retrovisceral danger prevertebral Pterygomandibular raphe Pharyngeal raphe Buccopharyngeal fascia Pharyngobasilar fascia Piriform sinus

Esophagus	Sphincters upper lower glands

Stomach	Curvatures greater lesser Angular incisure Cardia Body Fundus Pylorus antrum canal sphincter Gastric mucosa Gastric folds Microanatomy Gastric pits Gastric glands Cardiac glands Fundic glands Pyloric glands Foveolar cell Parietal cell Gastric chief cell Enterochromaffin-like cell

Lower

Small intestine

Microanatomy	Intestinal villus Intestinal gland Enterocyte Enteroendocrine cell Goblet cell Paneth cell

Duodenum	Suspensory muscle Major duodenal papilla Minor duodenal papilla Duodenojejunal flexure Brunner's glands

Jejunum	no substructures

Ileum	Ileocecal valve Peyer's patches Microfold cell

Large

Cecum	Appendix

Colon	Ascending colon Hepatic flexure Transverse colon Splenic flexure Descending colon Sigmoid colon Continuous taenia coli haustra epiploic appendix

Rectum	Transverse folds Ampulla

Anal canal	Anus Anal columns Anal valves Anal sinuses Pectinate line Internal anal sphincter Intersphincteric groove External anal sphincter

Wall

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