What drains the upper extremities deep vein?

The upper extremities' deep veins primarily drain into the subclavian veins, which then join the internal jugular veins to form the brachiocephalic veins. The deep veins of the arms, such as the radial and ulnar veins, accompany the arteries and eventually converge into the brachial veins before emptying into the subclavian vein. Through this system, deoxygenated blood from the upper extremities is transported back to the heart.