what makes a homogous structure
(evolutionary biology) Structures derived from a common ancestor or same evolutionary or developmental origin. Supplement. Homologous structures may not necessarily perform the same function but they share a common ancestral origin. For instance, the forelimbs of humans and bats are homologous structures.Although they are used differently, the basic skeletal structure is the same and they are derived from the same embryonic origin.or instance, the forelimbs of humans and bats are homologous structures. Although they are used differently, the basic skeletal structure is the same and they are derived from the same embryonic origin.