Ethmoid sinus

The ethmoid sinus is actually a pair of paranasal sinuses. They help filter the air that goes into the nasal cavity. These are located inside the ethmoid bone, which consists of ethmoidal air cells. There are three groups of the ethmoidal air cells: posterior, middle, and anterior. The cells are made up of a lot of cavities that have thin walls that reside in the ethmoidal labyrinth and are finished by the maxilla, frontal, lacrimal, palatine, and sphenoidal bones. They rest amid the top...

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    Full Ethmoid sinus Description

    [Continued from above] . . . portion of the orbits and the nasal cavities, and thin and bony laminae keep them apart from the cavities.