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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.
The maxillary sinuses are the largest of the paranasal sinuses and located in the body of the maxilla (upper jaw). It is the sinus that is the most likely to become infected and given its size and close proximity to other key structures on the skull, there is a risk of the infection spreading.