The radial branch can be suprafascial or subfascial.The suprafascial artery runs along the dorsum of the first metacarpal bone where it ends either as an axial vessel which continues to the dorsoulnar collateral artery or as a dense network of subcutaneous capillaries.The dorsoulnar collateral artery originates from the princeps pollicis through a perforating branch at the level of the neck of the first metacarpal bone. The subfascial artery runs within the superficial fibers of the first dorsal interosseus muscle.