part of part of has part has part characteristic of inheres in has modifier Hand polydactyly Abnormal thumb morphology Preaxial hand polydactyly Supernumerary thumb HP:0006182 HP:0001177 Polydactyly affecting the thumb Preaxial polydactyly of hands SNOMEDCT_US:445216006 Supernumerary digits located at the radial side of the hand. Polydactyly (supernumerary digits) involving the thumb occurs in many distinct forms of high variability and severity. Ranging from fleshy nubbins over varying degrees of partial duplication/splitting to completely duplicated or even triplicated thumbs or preaxial (on the radial side of the hand) supernumerary digits. HP:0005629 Extra thumb HP:0005634 UMLS:C1395852 thumb polydactyly HP:0009604 SNOMEDCT_US:205135003 Preaxial polydactyly abnormal increased amount manual digit 1 manus