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During normal respiration, air travels through the nose and into the lungs. Inside the bones of the skull are air pockets called sinuses. The four major sinuses that drain into the nose and throat are the frontal, maxillary, ethmoid, and sphenoid.
Sometimes foreign particles get past the cilia of the nose and enter one of the four sinus cavities.
The sinuses are also equipped with cilia that push mucous and particles out of the sinus ... more
