The left and right<unk> s (or innominate veins) in the upper chest are formed by the union of each corresponding internal jugular vein and subclavian vein.
These great vessels merge to form the superior vena cava.
The<unk> s are the major veins returning blood to the superior vena cava.
Brachiocephalic vein
Internal jugular vein
Subclavian vein
Iliac vein
Cephalic vein
Sinus venosus
Femoral vein
Popliteal vein