has part has part characteristic of inheres in has modifier Abnormality of the proximal phalanx of the thumb Broad proximal phalanx of the thumb 2009-01-29T05:09:41Z HP:0009630 Increased width of the proximal phalanx of the thumb. 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. UMLS:C4024267 Broad innermost thumb bone Broad middle phalanx of finger Broad proximal phalanges of the hand Broad thumb abnormal increased width proximal phalanx of manual digit 1