It has been suggested that the distinction between " acrocephalosyndactyly " versus " acrocephalopolysyndactyly " should be abandoned.
2.
In the case of acrocephalosyndactyly, selective cell death does not occur and skin, and rarely bone, between the fingers and toes fuses.
3.
Thus in humans " harelip, spina bifida, hydrocephalus " and " polydactyly " may be found in the same monster; while in " acrocephalosyndactyly " we find an egg-or dome-shaped skull, partial or complete fusion of digits in both hands and feet and, often in addition, harelip, contractures, spina bifida and mental abnormality.