The bone that protects the brain is called the skull. The skull is a complex structure composed of several bones that encase and safeguard the brain. It consists of two main parts: the cranium, which houses the brain, and the mandible, which is the jawbone. The cranium is made up of eight bones that are fused together to form a protective cage. In addition to protecting the brain, the skull also supports the structure of the face and houses the cavities for the eyes, ears, and nasal passages. Its shape and structure are critical for both protection and support.