Four pairs of air pockets lined with membranes in the bones around the nose.

small cavities in the skull behind the eyes and nose. this is where most vocal resonance occurs.

Air filled cavities around the nose which produce mucous for nasal filtering. The sinuses drain into the nose through small openings or ostia.

Air pockets inside the head

Cavities within the skull or bones of the head surrounding the nose. Sinuses allow the passage of air and mucus and are joined to the nasal passages. (Ear, Nose & Throat)

The spaces between the bones in the face where air passes and mucus drains

air-filled cavities (spaces) located in your forehead, cheekbones and behind the bridge of your nose. The sinuses produce a thin mucus that drains out of the channels of the nose. When a sinus becomes inflamed, usually as the result of an allergic reaction, a tumor or an infection, the inflammation will prevent the outflow of mucus and cause a pain similar to that of a headache.

Hollow air spaces located within the bones of the skull surrounding the nose.

air cavities within the facial bones, lined by mucous membranes similar to those in other parts of the airways.

air spaces within the skull that are in contact with ambient pressure through openings into the back of the nasal passages.

Air-filled cavities located above, beside and behind the nose and connected to the nose by tiny passages that carry sinus mucous into the nose. Sinuses serve as resonating chambers for speaking and singing. They also serve to reduce the weight of the skull by replacing dense bone with air-filled chambers.

Empty spaces or cavities usually within a bony structure.