has part has part characteristic of inheres in has modifier Short middle phalanx of finger Abnormality of the distal phalanx of the thumb Aplasia/Hypoplasia of the proximal phalanx of the thumb Short proximal phalanx of thumb 2009-01-29T05:11:02Z Hypoplastic/small proximal phalanx of the thumb HP:0006073 Hypoplastic (short) 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:C1855091 Short proximal thumb bone Short proximal thumb phalanx HP:0009638 Short proximal phalanges of thumb HP:0004079 Short phalanx of the thumb abnormal decreased length proximal phalanx of manual digit 1