頭蓋骨

1. Origins, structure, and basic meaning

• Structure: In 頭蓋骨 (ずがいこつ), cranium 頭蓋 and bone 骨 combine to denote the skull.
• Basic usage: 頭蓋骨 is the bony structure enclosing and protecting the brain and parts of the face.

2. Common pitfalls and similar expressions

• Skull versus brain
  • It is not the brain or the whole head, and 頭蓋骨の links it to shape, fracture, or another related noun.