noun
cranium; braincase
Anatomical term for the part of the skull that encloses the brain, as opposed to the facial skeleton.
脳頭蓋は脳を保護する役割を果たしている。
The cranium serves to protect the brain.
頭蓋骨 is the general term for the skull as a whole, including both the cranium and facial bones. 脳頭蓋 specifically refers to the part surrounding the brain.
Compound of 脳 (のう, 'brain') and 頭蓋 (とうがい, 'skull'). The reading is the standard on'yomi combination.