Human skull, coloured computed tomography (CT) scan. At top is the rounded cranium which houses the brain. The orbits (eye sockets) and nasal cavity (green) are seen. In mammals, the skull consists of 22 bones, most of which are fixed together by rigid joints called sutures. Together, they provide protection for the brain, support for the sight, smell and hearing organs, and anchor points for the lower mandible (jaw).
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