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'''Polydactyly''' is a [[birth defect]] which may affects the hands, feet, or both. It causes one or more extra [[finger]]s or [[toe]]s. It can affect people, and other [[mammals]] such as [[dog]]s, and [[cat]]s.
'''Polydactyly''' is a [[birth defect]] which may affects the hands, feet, or both. It causes one or more extra [[finger]]s or [[toe]]s. It can affect people, and other [[mammals]] such as [[dog]]s, and [[cat]]s.
==References==
== Polydactyly Media ==
<gallery widths='160px' heights='100%' mode='traditional' caption=''>
File:Polydactyly.jpg|Male with unilateral preaxial polydactyly affecting the left thumb. The supernumerary digit had normal sensation but no joint and hence could not move independently.
File:Polydactyly postaxial.gif|Illustration of a postaxial polydactyly right hand.
File:Polydactyly preaxial.gif|Illustration of a preaxial polydactyly right hand.
File:Shh ectopic expression.gif|Preaxial polydactyly: Ectopic SHH-expression, Hemingway mutant, mouse, right forelimb
File:X-ray of feet in polydactyly.jpg|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 deformity|varus angulation]], and the sixth toe has substantial [[Valgus deformity|valgus angulation]].
File:Polydactyly Left Hand.jpg|Type 1 ulnar polydactyly – an extra digit is attached by skin and nerves.
File:Polydactyly 01 Lfoot AP.jpg|Left foot with postaxial polydactyly of 5th ray
File:Preaxial polydactyly right hand.jpg|Preaxial polydactyly of the right hand.
File:Nuremberg chronicles - Strange People - Twelve Fingers (XIIv).jpg|Twelve-fingered man, illustrated in the 1493 ''[[Nuremberg Chronicles]]''
</gallery>
== References ==
{{commons category}}{{science-stub}}
{{commons category}}{{science-stub}}
[[Category:Limbs and extremities]]
[[Category:Limbs and extremities]]
[[Category:Developmental disorders]]
[[Category:Developmental disorders]]