Polydactyly
Polydactyly is a birth defect which may affects the hands, feet, or both. It causes one or more extra fingers or toes. It can affect people, and other mammals such as dogs, and cats.
Polydactyly Media
Male with unilateral preaxial polydactyly affecting the left thumb. The supernumerary digit had normal sensation but no joint and hence could not move independently.
Illustration of a postaxial polydactyly right hand.
Illustration of a preaxial polydactyly right hand.
Preaxial polydactyly: Ectopic SHH-expression, Hemingway mutant, mouse, right forelimb
Right-sided duplication of the right little toe in an 8.5 months old male, with two toes (fifth and sixth) apparently forming joints with the fifth metatarsal bone, which is mildly broadened distally. The duplicated toes have almost normal growth. The fifth toe has mild varus angulation, and the sixth toe has substantial valgus angulation.
Type 1 ulnar polydactyly – an extra digit is attached by skin and nerves.
Left foot with postaxial polydactyly of 5th ray
Preaxial polydactyly of the right hand.
Twelve-fingered man, illustrated in the 1493 Nuremberg Chronicles
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