Accessory hemiazygos vein
accessory hemiazygos vein
accessory hemiazygos vein n.
a vein that is formed by the union of the fourth to seventh left posterior intercostal veins, p-sses along the fifth, sixth, and seventh thoracic vertebrae, crosses the midline behind the aorta, esophagus, and thoracic duct, and empties into the azygos vein.
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