Uberon Homology note : The skull of ancestral tetrapods has the three basic components that we have been
considering: (1) chondrocranium, (2) splanchnocranium, and (3) dermatocranium (reference
1); Each part of the skull arises from a separate phylogenetic source. The most ancient
part is the splanchnocranium (visceral cranium), which first arose to support pharyngeal
slits in protochordates (reference 2).[well established][VHOG];