K H FUNG / SCIENCE PHOTO LIBRARY K H FUNG / SCIENCE PHOTO LIBRARY
Paranasal sinuses and throat. Coloured 3D computed tomography (CT) scan of a model of the human head and throat, showing the paranasal sinuses (pink, upper left) and the structures of the throat (centre). These include the nasopharynx, hypopharynx, larynx and trachea. The nasal cavity (blue) is in the nose. The paranasal sinuses are spaces in the bones surrounding the eyes and nose, and the cheek bones of the upper jaw. They lighten the bones of the skull and reduce the weight of the head. They are connected to the nasal passages and are lined with mucous membranes. They can fill with fluid and secrete mucus during an infection.
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