Frontal sinus


noun, plural: frontal sinuses

Either of a pair of paranasal sinuses situated between the inner and outer compact layers of the frontal bone, above the eyes. It communicates by the ethmoidal infundibulum with the middle meatus of the nasal cavity of the same side.


Frontal sinuses are one of the paranasal sinuses, the other being the ethmoid sinuses, maxillary sinuses, and sphenoid sinuses.

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