MSD Manual

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Locating the Sinuses
Locating the Sinuses

The sinuses are hollow cavities in the bones around the nose. The two frontal sinuses are located just above the eyebrows. The two maxillary sinuses are located in the cheekbones. The two groups of ethmoid sinuses are located on either side of the nasal cavity. The two sphenoid sinuses (not shown) are located behind the ethmoid sinuses.

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