Princeps pollicis artery
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The princeps pollicis artery (also known as the first palmar metacarpal artery) is a branch of the radial artery that supplies the thumb (1st digit). It arises from the radial artery just as it enters the palm and courses distally along the palmar aspect of 1st metacarpal. At the 1st metacarpophalangeal joint it bifurcates into two digital branches, radial and ulnar digital branches, that continue along the radial and ulnar aspects of the phalanges of the thumb respectively.