vena hemiazygos accessoria


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Noun1.vena hemiazygos accessoria - a vein formed by the union of the 4th to 7th posterior intercostal veinsvena hemiazygos accessoria - a vein formed by the union of the 4th to 7th posterior intercostal veins; empties into the azygos vein
vein, vena, venous blood vessel - a blood vessel that carries blood from the capillaries toward the heart; "all veins except the pulmonary vein carry unaerated blood"