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. For instance, the maxillary sinuses are created by the maxillary bones, the frontal sinuses are created by the frontal bone, and the ethmoidal and sphenoidal sinuses are each created by the ethmoid and sphenoid bones, respectively. Drainage ducts within the specific cavity facilitate the appropriate communication from each sinus. The paranasal sinuses also assist the process of warming and moistening the incoming air. Sound resonance to assist with vocalization is also produced throughout these sinuses. However, the most vital aspect of these sinus cavities is to produce a structural strength for the skull which in turn lightens the overall weigh of the skull.
Paranasal sinuses videos
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Maxillary Sinus Lift Surgery
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http://www.youtube.com/v/9UTPyhozpeA
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Openings to Paranasal Sinuses
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http://www.youtube.com/v/ZAww9_VNAqo
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