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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 possible functions of the sinuses are as follows:     1. air conditioning 2. pressure damping 3. reduction of skull weight 4. heat insulation 5. flotation of skull â¦ in water 6. increasing the olfactory area 7. mechanical rigidity 8. vocal resonance and diminution of auditory feedback. 9 There are four pairs sinuses, the maxillary is largest, then frontal ,ethmoidal and sphenoidal is (below eye sockets) is to provide mucous and act as a resonance chamber for sound +lighten weight of the skull. 10.