D. ROBERTS / SCIENCE PHOTO LIBRARY D. ROBERTS / SCIENCE PHOTO LIBRARY
Child's skull. Coloured X-ray of a child's skull. The cranium (upper centre) houses and protects the brain. The eye sockets (centre) and nasal cavity (lower centre) are also seen. The bones of the skull have fused together and secondary teeth (bottom centre) can be seen above the milk teeth they will eventually replace.
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