What Is the Azygos Vein?


Quick Answer

The azygos vein is a large vein running up the right side of the vertebral column that receives deoxygenated blood from the wall of the abdomen. It then transports blood into the superior vena cava vein.

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Full Answer

The azygos vein forms where the ascending lumbar and right subcostal veins join. It flows toward the root of the right lung, where it connects with the superior vena cava vein. It can also transport blood to the right atrium by allowing the blood to flow between the two venae cava veins when one of them is blocked. The azygos has no corresponding, symmetrical vein on the left side of the body. The hemiazygos and the accessory hemiazygos veins are considered tributaries of the azygos, not equivalents.

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