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Paranasal sinuses are filled with air Their function is to-humidify and warm the inspired air,provide resonance to voice,lighten the skull bones, andact as thermal insulatorsâ¦ to protect orbit and cranium from variation in temperature of air in our nose Paranasal sinuses are air containing cavities (hollow spaces) in certain bones of skull.
Head Congestion. There are four pairs of paranasal sinuses. Frontal sinuses are located above the eyes in the forehead bones. Your maxillary sinuses are the largest. They are found in the cheekbones and under your eyes. Ethmoid sinuses are between the eyes and the nose.