Into which vein does blood from the cephalic vein drain?

The cephalic vein is a prominent superficial vein in the upper limb that primarily drains the lateral aspect of the arm and forearm. It typically courses along the radial side of the forearm and then ascends in the arm toward the shoulder. The correct answer indicates that the cephalic vein drains into the subclavian vein, which is located just beneath the clavicle. The connection occurs at the point where the cephalic vein empties into the subclavian vein, allowing blood to be transported towards the heart.

This drainage pattern is significant as it plays a role in venous return, ensuring that blood from the upper extremities is efficiently delivered back to the cardiovascular system. The subclavian vein subsequently combines with the internal jugular vein to form the brachiocephalic vein, which leads to the superior vena cava.

Understanding this vascular pathway is essential for various clinical practices, including venipuncture, placement of central venous catheters, and other procedures involving venous access.