accessory hemiazygos vein


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ac·ces·so·ry hem·i·az·y·gos vein

[TA]
vein formed by the union of the fourth to seventh left posterior intercostal veins, it passes along the side of the bodies of the fifth, sixth, and seventh thoracic vertebrae, then crosses the midline posterior to the aorta, esophagus, and thoracic duct, and empties into the azygos vein, sometimes in common with the hemiazygos vein.

ac·ces·so·ry hem·i·az·y·gos vein

(ak-ses'ŏr-ē hem'ē-ā-zī'gos vān) [TA]
Formed by the union of the fourth to seventh left posterior intercostal veins, passes along the side of the bodies of the fifth, sixth, and seventh thoracic vertebrae, then crosses the midline behind the aorta, esophagus, and thoracic duct, and empties into the azygos vein, sometimes in common with the hemiazygos vein.
Synonym(s): vena hemiazygos accessoria [TA] .

accessory hemiazygos vein

A vein running along the back wall of the upper thorax to the left of the thoracic aorta; at the level of the seventh thoracic vertebra, the accessory hemiazygos vein bends rightward, runs behind the aorta, and drains into the azygos vein. Tributaries of the accessory hemiazygos vein include the left superior intercostal veins, the upper left intercostal veins, and left bronchial veins. The patterns and interconnections of the azygos, hemiazygos, and accessory azygos veins are variable.
See also: vein