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A sinus is an air cavity in bone.

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Q: What is an air-filled bony cavity?
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What is the difference between the bony nasal cavity and the nasal cavity?

The bony nasal cavity is made up of the hard palate and the palatine process of the maxilla. The nasal cavity is made up of the rest of the nasal sinuses and includes the bony nasal cavity.


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What are the bony ridges that warm air called?

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