This involvement of the oval window forms the basis of the name fenestral otosclerosis. The most common location of involvement of
Kaynak: Otosclerosis

This fenestral architecture has been seen in ancient archosaurs , but not in other pachycephalosaurs. Consequently, if unreduced superior
Kaynak: Dracorex

Mammals, which are synapsids, possess no fenestral openings in the skull, as the trait has been modified. They do, though, still have the
Kaynak: Skull