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14 June, 23:08
A sinus is defined as?
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Beckett Lam
15 June, 00:20
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An air-filled cavity in a dense portion of a skull bone. The sinuses decrease the weight of the skull. The sinuses are formed in four right-left pairs. The frontal sinuses are positioned behind the forehead, while the maxillary sinuses are behind the cheeks.
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Aurora Schwartz
15 June, 01:55
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A cavity within a bone or other tissue, especially one in the bones of the face or skull connecting with the nasal cavities.
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