APA Dictionary of Psychology

an inherited condition in which premature closure of some of the cranial sutures (see craniosynostosis syndrome) affects the shape of the head and face, and is accompanied by syndactyly. The syndactyly usually involves both hands and feet and typically results in fusion of the skin and bones, marked by “mitten hands” and “sock feet.” Apert syndrome may be complicated by Crouzon syndrome (and called Apert–Crouzon syndrome), in which case fusion of the digits is partial. See also acrocephalosyndactyly). [Eugène Apert (1868–1940), French pediatrician]