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lum·bar vein(lŭm'bahr vān)
Veins accompanying the lumbar arteries, which drain the posterior body wall and the lumbar vertebral venous plexuses, and terminate anteriorly as follows: the first and second in the ascending lumbar vein, the third and fourth in the inferior vena cava, and the fifth in the iliolumbar vein; all communicate via the ascending lumbar veins.
Any of the four veins on each side of the body that run transversely and drain the posterior abdominal wall; they accompany the lumbar arteries. The lumbar veins, which are interconnected with each other and with the epigastric veins, empty into the inferior vena cava or the azygos vein.
See also: vein