The term "cranium" is sometimes used as a synonym for "skull".[5] It is also sometimes defined as all of the skull bones, except the mandible.[6]
The term "neurocranium", "brain box",[7] or "braincase"[6] are sometimes used to define the portion of the cranium which encloses the brain. (This may be nearly synonymous with some of the more conservative definitions of "cranium".)