Drawing of a hand with one more thumb or finger than usual.Left foot with postaxial polydactyly of 5th rayRight foot with postaxial polydactyly of 5th rayLeft hand with mid-ray duplicationRight hand with mid-ray duplication
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Polydactyly

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

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Overview

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 1 child in every 500, although the frequency varies greatly from population to population. It is higher in some groups (e.g. the Amish in the United States) due to the founder effect.

Historically and in the contemporary world, polydactylyism 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 with cleft lip/palate and psychomotor retardation (Varadi-Papp Syndrome)
  • Polydactyly myopia syndrome
  • Polydactyly postaxial dental and vertebral
  • Polydactyly postaxial with median cleft of upper lip
  • Polydactyly postaxial
  • Polydactyly preaxial type 1
  • Polydactyly syndrome middle ray duplication
  • Polydactyly visceral anomalies cleft lip palate

Read more at Wikipedia.org


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Gale Encyclopedia of Medicine : Polydactyly and syndactyly $3.10 Polydactyly: A Medical Dictionary, Bibliography, And Annotated Research Guide To Internet References $39.41
Genetics of the Polydactyly-Luxate Syndrome in the Norway Rat, Rattus Norvegicus (Acta Universitatis Carolinae. Medica, Monographia) Bromodeoxyuridine induced polydactyly: An approach to defining the mechanism
Some new pedigrees of hereditary disease: A. Polydactylism and syndactylism : B. Blue sclerotics and fragility of bone

Polydactyly and syndactyly
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