internal thoracic vein

internal thoracic vein

n.

Either of usually two veins that accompany each internal thoracic artery, fusing together at the upper part of the chest and emptying into the brachiocephalic vein.

---

internal thoracic vein,

one of a pair of veins that accompanies the internal thoracic artery, receiving tributaries that correspond to those of the artery. It forms a single trunk that runs up on the medial side of the artery and ends in the corresponding brachiocephalic vein. The superior phrenic vein usually opens into the internal thoracic vein.