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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.
PARANASAL SINUSES ANATOMY. 1  Air cavities, which in the nasal cavity are paired, between certain bones in the skull are known as paranasal sinuses. The bones which surround these sinuses and create the cavity are also responsible for the naming of the particular sinus.