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Sinus-Stricken?The sinuses are a connected system of hollow cavities in the skull. The largest sinus cavities are around an inch across; others are much smaller. The sinus cavities include: The maxillary sinuses (the largest), in the cheekbones. The frontal sinuses, in the low-center of the forehead. The ethmoid sinuses, between the eyes, at the nasal bridge. The sphenoid sinuses, in bones behind the nasal cavity. The sinuses are lined with soft, pink tissue called mucosa. Normally, the sinuses are empty except for a thin layer of mucus. The inside of the nose has ridges called turbinates. Normally these structures help humidify and filter air. The nose is divided in the center by a thin wall, called the septum. Most of the sinuses drain into the nose through a small channel or drainage pathway called the middle meatus. The purpose of the sinuses is unclear. One theory is that sinuses help humidify the air we breathe in; another is that they enhance our voices.