The veins of the upper limb are divided into superficial and deep systems. The superficial veins, such as the cephalic and basilic veins, run above the deep fascia, while the deep veins, including the brachial, radial, and ulnar veins, accompany arteries. The axillary vein serves as the major drainage conduit, continuing into the subclavian vein and subsequently the brachiocephalic vein.