What term describes the webbing or fusing of two or more fingers or toes?

The term that describes the webbing or fusing of two or more fingers or toes is syndactyly. This condition can vary in severity, ranging from partial webbing of fingers or toes to the total fusion of multiple digits. Syndactyly occurs due to a developmental anomaly during the embryonic stage, when the fingers or toes do not separate properly. This condition can be an isolated presentation or part of a syndrome, and it may require surgical intervention if it affects function or appearance.

The other terms refer to different congenital conditions: polydactyly describes the presence of extra fingers or toes, microcephaly refers to a condition where a baby’s head is smaller than expected, and hexadactyly indicates the occurrence of six digits on a hand or foot. Each of these conditions has distinct definitions, serving to clarify the specific nature of congenital limb variations.