What defines the maxillary air sinus?

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A paranasal air sinus located near the maxillaA venous sinus found adjacent to the maxillaA paranasal air sinus within the maxilla boneA venous sinus that extends into the maxilla

Explanation

The maxillary air sinus is a paranasal air-filled cavity positioned close to the maxilla bone. It is not a venous sinus, which refers to blood vessels, but an air-filled space connected to the nasal cavity.