has part has part characteristic of inheres in has modifier Broad metacarpals Broad proximal phalanges of the hand Abnormal 1st metacarpal morphology Broad 1st metacarpal 2009-05-27T04:24:30Z UMLS:C4024097 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. Wide 1st long bone of hand HP:0010027 abnormal increased width metacarpal bone of digit 1