SOVEREIGN, ISM / SCIENCE PHOTO LIBRARY SOVEREIGN, ISM / SCIENCE PHOTO LIBRARY
Skull. X-ray of a side-view of a healthy skull. The bones of the cranium (centre to right) are fused together to form a solid structure that encloses and protects the brain. At bottom left are the teeth. Above the teeth is the nose. The dark spaces around the nose are the paranasal sinuses (air-filled spaces). The sinuses decrease the weight of the front of the skull, aid in warming and humidifying inhaled air, and increase the resonance of the voice. One of the eye sockets (orbits) is seen above the nose.
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