Human skull. Frontal X-ray of a human skull, showing the bones of the cranium (top) and face (bottom). The skull consists of the cranium, which protects the brain, and the facial bones. The facial bones include the mandible and the maxilla, the jaw bones that contain the teeth (lower centre). The facial bones include the bones around the eyes (the orbits of the eyes) and the air-filled bones that contain the paranasal sinuses and the nasal cavity (centre).