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The paranasal sinuses, which are known commonly simply since the sinuses, are some of four categories of cavities during the bones adjoining the nose: maxillary, the most significant, between the eye socket and then the palate and upper jaw; frontal, just above and amongst the eye sockets; ethmoid, including things like 3 thinwalled cavities involving the nasal cavities and the eye sockets; and sphenoid, behind the nasal cavity.
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Last link added: Nov 09, 2015
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Last link added: Nov 09, 2015