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Polydactyly

From Academic Kids

Polydactyly, or polydactylism, is the anatomical abnormality of having more than the usual number of digits on the hands or feet. It is a congenital abnormality, usually genetically inherited as an autosomal dominant trait.

Contents

Overview

Missing image
Polydactyly.png
Drawing of a hand with one more thumb or finger than usual.

In humans, it is usual to have five digits (four fingers and one thumb) on each hand, and five digits (toes) on each foot. Polydactyls have six or maybe even more digits on either their hands or feet, or both. The extra digits vary from small pieces of soft tissue to apparently complete digits. In Western societies, they are usually surgically removed during early life.

The condition is reported in about 2 children in every thousand, although the frequency varies greatly from population to population. It is higher in some groups (e.g. the Pennsylvania Dutch in the United States) due to the founder effect.

Historically and in the contemporary world, polydactyly has been associated with witchcraft, psychic power, the extraterrestrial, divine connection, and sporting prowess.

Types of polydactyly

There are several types of polydactyly, of varying frequency. Here are some of them:

  • Polydactyly alopecia seborrheic dermatitis
  • Polydactyly cleft lip palate psychomotor retardation
  • Polydactyly myopia syndrome
  • Polydactyly postaxial dental and vertebral
  • Polydactyly postaxial with median cleft of upper lip
  • Polydactyly postaxial
Missing image
Polydactyly_01_Lfoot_AP.jpg
Left foot with postaxial polydactly of 5th ray
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Polydactyly_01_Rfoot_AP.jpg
Right foot with postaxial polydactly of 5th ray
  • Polydactyly preaxial type 1
  • Polydactyly syndrome middle ray duplication
Missing image
Polydactyly_01_Lhand_AP.jpg
Left hand with mid ray duplication
Missing image
Polydactyly_01_Rhand_AP.jpg
Right hand with mid ray duplication
  • Polydactyly visceral anomalies cleft lip palate


Related articles

External links

fr:Polydactylie nl:Polydactylie

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