Brachiocephalic v.

The left and right brachiocephalic veins (or innominate veins) are formed by the union of the internal jugular vein and subclavian vein on each side at the level of the sternoclavicular joint. The left brachiocephalic vein is usually longer than the right.

The left and right brachiocephalic veins merge to form the superior vena cava behind the junction of the first costal cartilage with the manubrium sternum.

The brachiocephalic veins receive blood from the:

• Left and right internal thoracic veins: drain into the inferior border of their corresponding brachiocephalic vein.

• Left and right inferior thyroid veins: drain into the superior aspect of their corresponding brachiocephalic vein near the confluence.

• Left superior intercostal vein: drains into the left brachiocephalic vein.