where it lies beneath the tendon of the flexor pollicis longus muscle and divides into two branches.

These make their appearance between the medial and lateral insertions of the adductor pollicis, and run along the sides of the thumb, forming an arch on the palmar surface of the distal phalanx, from which branches are distributed to the integument and subcutaneous tissue of the thumb.

The princeps pollicis has a particularly strong pulse

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