Paranasal sinuses. Illustration of a frontal section through the nasal cavities and facial bones, showing the paranasal sinuses (red) and the muscle structure (grey). Shown here are the frontal sinus, the ethmoid sinus and the maxillary sinus. These are air spaces in the facial bones around the eyes and nose. An infection of the membranes in these spaces (sinusitis) causes an increase in mucus production, which can block the sinuses, causing internal pressure. | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Bavosi, John |
Taille de l’image : | 4889 px × 3656 px |
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