has part has part characteristic of part of inheres in part of has modifier Abnormality of the epiphyses of the hallux Abnormality of the epiphysis of the 1st metatarsal 2009-05-29T01:17:54Z HP:0010125 Abnormality of the end part of the 1st long bone of foot UMLS:C4024034 In contrast to the metatarsals 2-5, the first metatarsal is embryologically of phalangeal origin and as such equivalent to the proximal phalanges of the digits 2-5, whereas the proximal phalanx of the big toe is equivalent to the middle phalanges of the other digits. This term applies to abnormalities of the epiphysis of the first metatarsal bone. quality abnormal epiphysis of first metatarsal bone