cranium

Trump’s cranium seemed ready to explode.

The creature’s cranium was like a dark cave with no exit!

The head had been crushed, possibly by rockfall, relatively soon after death -- after the brain decomposed but before the cranium filled with dirt -- and then compacted further by tens of thousands of years of sediment.

A necessary but often-overlooked cranium cover.

In vertebrates, where the comparatively large brain is enclosed in a compact cranium, another space-saving mechanism plays a major role: myelination.