Uberon definition : The left and right brachiocephalic veins in the upper chest are formed by the union
of each corresponding internal jugular vein and subclavian vein. This is at the level
of the sternoclavicular joint. These great vessels merge to form the superior vena
cava. The brachiocephalic veins are the major veins returning blood to the superior
vena cava.;
The left and right brachiocephalic veins in the upper chest are formed by the union
of each corresponding internal jugular vein and subclavian vein. This is at the level
of the sternoclavicular joint. These great vessels merge to form the superior vena
cava. The brachiocephalic veins are the major veins returning blood to the superior
vena cava.