DANIEL SAMBRAUS / SCIENCE PHOTO LIBRARY DANIEL SAMBRAUS / SCIENCE PHOTO LIBRARY
Human skull. The rounded cranium (upper centre) houses and protects the brain. The upper and lower jaws (lower left), the eye sockets (orbits) and nasal cavity (centre left) are also seen. The bones of the skull are fixed together by rigid joints called sutures (one seen at centre right, black). The exception is the hinged lower jaw.
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