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Jejunal Arteries
Cardiovascular System

Jejunal Arteries

Arteriae jejunales

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Quick Facts

Origin: Superior mesenteric artery.

Course: Branches emerge from the left side of the superior mesenteric artery and pass between the layers of the mesentery to the left and anterior.

Branches: Anastomoses with its own and neighboring branches forming highly interconnected arterial arcades.

Supplied Structures: Jejunum.

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Origin

The jejunal arteries emerge as four to six branches from the left side of the proximal part of the superior mesenteric artery.

Course

The jejunal arteries pass between the layers of the mesentery to the left and away from the posterior abdominal wall out to the jejunum. Along their course, the jejunal arteries form one to three tiers of anastomotic arcades and a series of straight vasa recta.

Branches

The jejunal arteries branch along their course, anastomosing with its own and neighboring branches, forming highly interconnected arterial arcades. The arcades give off terminal branches that pass straight out to the jejunum.

Due to the rich anastomoses within the arterial arcades, blockage of the jejunal arteries and their proximal arcades rarely leads to ischemia because of collateral flow. However, anastomoses between neighboring vasa recta are rare, thus, blockage of several consecutive vasa recta may produce segmental bowel ischemia.

Supplied Structures

As the name suggests, the jejunal arteries supply the jejunum.

Learn more about this topic from other Elsevier products

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When the artery is occluded blood is forced through the collateral vessels, drastically increasing fluid shear stress and triggering an inflammatory response which drives vessel remodeling.

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