Facial sinuses. X-ray of the skull of a young child, showing normal facial sinuses. The sinuses are found in the forehead, cheekbones and behind and around the nose. The sinuses lighten the skull, make the voice more resonant, and produce mucus that drains into the nose. Infection, often provoked by a cold, causes sinusitis, where the mucous membrane lining the sinuses becomes inflamed. The jawbones and teeth can be seen in red at the lower middle of the image.
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