Duodenojejunal flexure
Disclosures
- updated 30 Aug 2022:
- Philips Australia, Paid speaker at Philips Spectral CT events (ongoing)
Updates to Article Attributes
Body
was changed:
The duodenojejunal (DJ) flexure or junction is the anatomical border between the duodenum and the jejunum.
Gross anatomy
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.
Relations
Anterior
- transverse colon and mesocolon
- peritoneum of the root of the small bowel mesentery
Posterior
- aorta
- inferior mesenteric vein (or at its lateral margin)
- left sympathetic trunk
- left renal vessels
- left gonadal vessels
Superior
- inferior border of body of pancreas
Blood supply
Arterial
- branches from the first jejunal branch of the superior mesenteric artery
- frequently, a terminal branch of the anterior superior pancreaticoduodenal artery
Venous
- venous anatomy not well characterised
- veins accompany arteries of corresponding names and may drain directly into the superior mesenteric vein
Innervation
sympathetic: periarterial
plexuses on the branches of thecoeliacarteryplexus and superior mesentericarteryplexusparasympathetic: vagal fibres from the coeliac plexus synapse on neurones in the duodenal wall
Variant anatomy
For uncommon variant anatomy of the duodenojejunal flexure, see
-<p>The <strong>duodenojejunal (DJ) flexure</strong> or<strong> junction</strong> is the anatomical border between the <a href="/articles/duodenum">duodenum</a> and the <a href="/articles/jejunum">jejunum</a>.</p><h4>Gross anatomy</h4><p>The duodenojejunal flexure is located anterolateral to the <a href="/articles/aorta">aorta</a> at the level of the upper border of the second <a href="/articles/lumbar-spine">lumbar vertebra</a>. It makes a sharp turn anteroinferiorly to become the jejunum.</p><p>The duodenojejunal flexure is suspended from the <a href="/articles/ligament-of-treitz">ligament of Treitz</a>, which serves as its surgical landmark and gives it its unique shape. It also marks the small bowel's transition from the <a href="/articles/retroperitoneum">retroperitoneum</a>, which invests the duodenum, into the <a href="/articles/peritoneum">peritoneal cavity</a>.</p><h5>Relations</h5><h6>Anterior</h6><ul>-<li>-<a href="/articles/transverse-colon">transverse colon</a> and <a href="/articles/transverse-mesocolon">mesocolon</a>-</li>-<li>peritoneum of the <a href="/articles/root-of-the-mesentery">root</a> of the <a href="/articles/small-bowel-mesentery">small bowel mesentery</a>-</li>-</ul><h6>Posterior</h6><ul>-<li><a href="/articles/aorta">aorta</a></li>-<li>-<a href="/articles/inferior-mesenteric-vein">inferior mesenteric vein</a> (or at its lateral margin)</li>-<li>left <a href="/articles/sympathetic-nervous-system-1">sympathetic trunk</a>-</li>-<li>left renal vessels</li>-<li>left gonadal vessels</li>-</ul><h6>Superior</h6><ul><li>inferior border of body of <a href="/articles/pancreas">pancreas</a>-</li></ul><h4>Blood supply</h4><h5>Arterial</h5><ul>-<li>branches from the first jejunal branch of the <a href="/articles/superior-mesenteric-artery">superior mesenteric artery</a>-</li>-<li>frequently, a terminal branch of the anterior <a href="/articles/superior-pancreaticoduodenal-artery">superior pancreaticoduodenal artery</a>-</li>-</ul><h5>Venous</h5><ul>-<li>venous anatomy not well characterised</li>-<li>veins accompany arteries of corresponding names and may drain directly into the <a href="/articles/superior-mesenteric-vein">superior mesenteric vein</a>-</li>-</ul><h4>Innervation</h4><ul>-<li><p><a href="/articles/sympathetic-nervous-system-1">sympathetic</a>: periarterial plexuses on the branches of the coeliac artery and superior mesenteric artery</p></li>-<li><p><a href="/articles/parasympathetic-nervous-system">parasympathetic</a>: <a href="/articles/vagus-nerve">vagal fibres</a> from the <a href="/articles/coeliac-plexus">coeliac plexus</a> synapse on neurones in the duodenal wall</p></li>-</ul><h4>Variant anatomy</h4><p>For uncommon variant anatomy of the duodenojejunal flexure, see</p><ul>-<li><a href="/articles/intestinal-malrotation">intestinal malrotation</a></li>-<li><a href="/articles/intestinal-nonrotation">intestinal nonrotation</a></li>- +<p>The <strong>duodenojejunal (DJ) flexure</strong> or<strong> junction</strong> is the anatomical border between the <a href="/articles/duodenum">duodenum</a> and the <a href="/articles/jejunum">jejunum</a>.</p><h4>Gross anatomy</h4><p>The duodenojejunal flexure is located anterolateral to the <a href="/articles/aorta">aorta</a> at the level of the upper border of the second <a href="/articles/lumbar-spine">lumbar vertebra</a>. It makes a sharp turn anteroinferiorly to become the jejunum.</p><p>The duodenojejunal flexure is suspended from the <a href="/articles/ligament-of-treitz">ligament of Treitz</a>, which serves as its surgical landmark and gives it its unique shape. It also marks the small bowel's transition from the <a href="/articles/retroperitoneum">retroperitoneum</a>, which invests the duodenum, into the <a href="/articles/peritoneum">peritoneal cavity</a>.</p><h5>Relations</h5><h6>Anterior</h6><ul>
- +<li>
- +<a href="/articles/transverse-colon">transverse colon</a> and <a href="/articles/transverse-mesocolon">mesocolon</a>
- +</li>
- +<li>peritoneum of the <a href="/articles/root-of-the-mesentery">root</a> of the <a href="/articles/small-bowel-mesentery">small bowel mesentery</a>
- +</li>
- +</ul><h6>Posterior</h6><ul>
- +<li><a href="/articles/aorta">aorta</a></li>
- +<li>
- +<a href="/articles/inferior-mesenteric-vein">inferior mesenteric vein</a> (or at its lateral margin)</li>
- +<li>left <a href="/articles/sympathetic-nervous-system-1">sympathetic trunk</a>
- +</li>
- +<li>left renal vessels</li>
- +<li>left gonadal vessels</li>
- +</ul><h6>Superior</h6><ul><li>inferior border of body of <a href="/articles/pancreas">pancreas</a>
- +</li></ul><h4>Blood supply</h4><h5>Arterial</h5><ul>
- +<li>branches from the first jejunal branch of the <a href="/articles/superior-mesenteric-artery">superior mesenteric artery</a>
- +</li>
- +<li>frequently, a terminal branch of the anterior <a href="/articles/superior-pancreaticoduodenal-artery">superior pancreaticoduodenal artery</a>
- +</li>
- +</ul><h5>Venous</h5><ul>
- +<li>venous anatomy not well characterised</li>
- +<li>veins accompany arteries of corresponding names and may drain directly into the <a href="/articles/superior-mesenteric-vein">superior mesenteric vein</a>
- +</li>
- +</ul><h4>Innervation</h4><ul>
- +<li><p><a href="/articles/sympathetic-nervous-system-1">sympathetic</a>: periarterial <a title="coeliac plexus" href="/articles/coeliac-plexus">coeliac plexus</a> and <a title="superior mesenteric plexus" href="/articles/superior-mesenteric-plexus">superior mesenteric plexus</a></p></li>
- +<li><p><a href="/articles/parasympathetic-nervous-system">parasympathetic</a>: <a href="/articles/vagus-nerve">vagal fibres</a> from the coeliac plexus synapse on neurones in the duodenal wall</p></li>
- +</ul><h4>Variant anatomy</h4><p>For uncommon variant anatomy of the duodenojejunal flexure, see</p><ul>
- +<li><a href="/articles/intestinal-malrotation">intestinal malrotation</a></li>
- +<li><a href="/articles/intestinal-nonrotation">intestinal nonrotation</a></li>
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