Final answer:
The brachiocephalic vein drains into the superior vena cava. External jugular veins empty into the subclavian vein. Superior vena cava receives blood from brachiocephalic veins.
Explanation:
Brachiocephalic vein is the vein that directly empties into the superior vena cava. It forms from a fusion of the external and internal jugular veins and the subclavian vein.
External jugular veins drain blood from the superficial portions of the head and flow into the subclavian vein.
The superior vena cava drains most of the body superior to the diaphragm and receives blood from the right and left brachiocephalic veins.
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