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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.
52-7 The paranasal sinuses develop as outgrowths from the nasal cavity; hence they all drain directly or indirectly into the nose. Thus, rhinitis may give rise to sinusitis. 52-8 List the chief paranasal sinuses. 52-8 The chief paranasal sinuses are the maxillary, ethmoidal, frontal, and sphenoidal.