Schisis association describes the combination of two or more of the following anomalies: neural tube defects (e.g. anencephaly, encephalocele, spina bifida cystica), cleft lip/palate, omphalocele and congenital diaphragmatic hernia (see these terms). These anomalies are associated at a higher frequency than would be expected with random combination rates.

Webbing or fusion of the fingers or toes, involving soft parts only or including bone structure. Bony fusions are referred to as \"bony\" syndactyly if the fusion occurs in a radio-ulnar axis. Fusions of bones of the fingers or toes in a proximo-distal axis are referred to as \"symphalangism\".