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neurocranium

n. (context anatomy English) The part of the cranium that encloses the brain

Wikipedia
Neurocranium

In mammals, the neurocranium, also known as the braincase, brainpan, or brain-pan is the upper and back part of the skull.

The skull can be divided into two parts: the neurocranium, which forms a protective case around the brain, and the facial skeleton, which forms the skeleton of the face.

In the human skull, the neurocranium includes the calvaria, or skullcap. The lower part of the skull is the facial skeleton also known as the splanchnocranium.