Brachiocephalic Vein

The Brachiocephalic veins are the union of the subclavian and internal jugular veins. The right brachiocephalic vein is formed behind the right sternoclavicular joint and descends vertically. The left brachiocephalic vein passes almost horizontally across the superior mediastinum to join the right vein at the lower border of the first right costal cartilage.

In children and infants the left brachiocephalic vein develops and courses in the lower neck rather than the superior mediastinum.