Princeps pollicis artery
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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 and can be used for ascertaining one's heart rate. For this reason, the pulse of the thumb is substantially stronger than that of the other digit, and thus it should not be used to read the pulses of others, as it may produce false positives.
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