article_snippet: Polydactyly is a medical term used to describe extra fingers on the hands or toes on the feet.
article_snippet: The extra fingers or toes may be small and non-functional,  or The extra fingers or toes may be fully formed with bones and joints.
article_snippet: Extra digits can exist in different places on the hands and feet.
article_snippet: Extra digits can also be located in the centre of the hand or foot, and people with polydactyly often have extra digits on both hands or feet.
article_snippet: Polydactyly occurs when the body follows a different set of directions than usual while forming the hands or feet during development.
article_snippet: Researchers are still discovering the genes that cause extra digits.