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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.
1. Air enters the paranasal sinuses from the nasal cavity and mucus drains into the nasal cavity from the sinuses 2.Lighten the skull and enhance the resonance of the voice.