Definition of Vein, brachial

Vein, brachial: A vein that accompanies the brachial artery between the shoulder and the elbow. The route of the brachial artery is from the shoulder down to the elbow, whereas that of the brachial vein is in the reverse direction -- from the elbow back up to the shoulder.

Veins often appear to accompany arteries while the blood within them is coursing in opposite directions.