Respiratory System

Structure and Function

What are the functions of the paranasal sinuses?

The paranasal sinuses are membrane-linked, air-filled cavities in the bones of the skull that are connected to the nose by passageways. The four paranasal sinuses and the bones in which they are located are the frontal, ethmoid, maxillary, and sphenoid. These cavities lighten the weight of the bones and add resonance to the voice.


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