Explore the human skull like never before with a 3D simulation that lets you dive deep into its fascinating world. Rotate, zoom, and click your way through its every part to understand how this bony casing protects one of the body’s most vital organs. The human skull is a hard, protective case for the brain. The bones of the skull are joined by a type of immovable joint known as sutures. These unique joints allow the cranial bones to interlock tightly, ensuring maximum protection.