Cephalic vein

Overview
In human anatomy, the cephalic vein is a superficial vein of the upper limb.

It communicates with the basilic vein via the median cubital vein at the elbow and is located in the superficial fascia along the anterolateral surface of the biceps brachii muscle.

Superiorly the cephalic vein passes between the deltoid and pectoralis major muscles (deltopectoral groove) and through the deltopectoral triangle, where it empties into the axillary vein.

It is often visible through the skin, and its location in the deltopectoral groove is fairly consistent, making this site a good candidate for cannulation.