label: Broad 1st metacarpal
label_lc: broad 1st metacarpal
description: "Increased width of the 1st metacarpal. In contrast to the proximal phalanges of the digits 2-5, the proximal phalanx of the thumb is embryologically equivalent to the middle phalanges of the other digits, whereas the first metacarpal is embryologically of phalangeal origin and as such equivalent to the proximal phalanges of the other digits."