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INTRODUCTION. The paranasal sinuses (âthe sinusesâ) are air-filled cavities located within the bones of the face and around the nasal cavity and eyes. Each sinus is named for the bone in which it is located: Physiology.
The maxillary sinuses are the largest of the paranasal sinuses. These are located within the areas of the upper jaws, below the eye sockets and behind the cheekbone. The drainage of the mucus from the maxillary sinus is through an opening called the ostium. Any obstruction to the mucus flow from the maxillary sinuses may cause a sinus infection. Amongst the other sinuses, maxillary sinus infection is most common.