paranasal sinuses

Sinonasal tract

What is the sinonasal tract? The sinonasal tract is an area of the head that includes the nasal cavity (the inside of the nose) and the paired paranasal sinuses (small air-filled surrounding the nasal cavity). The paranasal sinuses include the maxillary sinus, frontal sinus, ethmoid sinus, and sphenoid sinus. The inside of the nasal cavity …
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