Apert’s Syndrome is a syndrome of genetic origin considered rare (above 1 in every 160 000 live births).
There is a variation in the numbers of its incidence, ranging from 1 to 80,000 to 1 to 300,000 live births, depending on the source consulted. It was described by the French physician Eugène Apert in 1906, and is characterized by a set of craniofacial anomalies resulting from premature craniosynostosis, associated with syndactyly. It is therefore an acrocephalosyndactyly.
Among the morphological changes found in Apert syndrome, the main one is complex syndactyly (feet and hands fused totally or partially). Another striking feature is the presence of acrocephaly, hence the syndrome defined as acrocephalosyndactyly.
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Roughly speaking, in relation to hands and feet, the best known classification is that of Upton  which presents, with some variations, three types:
Type 1: index, middle and ring fingers together, with bone fusion; free thumb and little fingers. The palm is flat (“paddled hand”)
wherein the thumb and little fingers are separated only from the middle and ring fingers, and the palm of the hand is flat.
Type 2: fused thumb with index finger (ranging from simple to complex syndactyly), and other fingers fused. The palm is concave (“gloved hand”).
Type 3: complex and total fusion of the fingers, which may overlap with the palm of the hand (“flower bud hand”).