Syndactyly

Syndactyly (from Greek συν- meaning "together" and δακτυλος meaning "finger") is a condition where in two or more digits are fused together. It occurs normally in some mammals, such as the siamang and diprotodontia, but is an unusual condition in humans.

Classification

Syndactyly can be simple or complex.

Syndactyly can be complete or incomplete.

Complex syndactyly occurs as part of a syndrome (such as Apert syndrome) and typically involves more digits than simple syndactyly.

Fenestrated syndactyly means the skin is joined for most of the digit but in a proximal area there is gap in the syndactyly with normal skin. This type of syndactyly is found in amniotic band syndrome.