The blood supply of the first web was multisource, being mainly supplied by the first dorsal metacarpal artery and dorsal perforators of the palmar artery in the first web. The dorsal perforators of the palmar artery commonly arose from RPDAIF and UPDAT in the first web and could be classified into three types, ulnar perforator, intermediate perforator and radial perforator, according to the piecing point of the perforatorsthe radial palmar digital artery of the index fingerulnar palmar digital artery of the thumb