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Right Subcostal Vein
Cardiovascular System

Right Subcostal Vein

Vena subcostalis dextra

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The subcostal vein originates under the twelfth rib.


The subcostal vein runs with the subcostal artery inferior to the twelfth rib and anterior to the twelfth thoracic vertebral body. Inferior to the diaphragm, the subcostal vein unites with the ascending lumbar vein to form the azygos vein on the right and the hemiazygos vein on the left. The vein pierces the aponeurosis of transversus abdominis muscle and travels between it and the internal abdominal oblique muscle.


The subcostal veins receive dorsal branches, similar to the intercostal veins. It forms anastomoses with the superior epigastric, lower posterior intercostal, and lumbar veins.

Structures Drained

The subcostal vein drains the upper posterior abdominal wall, inferior to the twelfth ribs.

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A venous sinus is a vein with a thin wall of endothelium that is devoid of smooth muscle to regulate its diameter.

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