Main Entry: ascending lumbar vein Function: noun : a longitudinal vein on each side that connects the lumbar veins and is frequently the origin of the azygos vein on theright side and of the hemiazygos vein on the left
ascending lumbar veinn. A vein that arises from the sacral and lumbar veins and at the diaphragm becomes the azygos vein on the right side and the hemiazygos vein on the left.
