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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.
These are called the paranasal sinuses. They lighten the skull and give resonance to the voice. The paranasal sinuses have the same kind of tissue that lines the inside of the nose. The same things that can cause swelling in the nose, allergies or infection, can also affect the sinuses. When the tissue inside the sinuses swells, mucus increases. Over time, air trapped inside swollen sinuses can create painful pressure inside the head. This is a sinus headache.