Which part is the maxillary sinus?

The maxillary sinuses are located in the cheek area beside the nose, beneath the two cheekbones and above the teeth.

The maxillary sinus is a pair of paranasal sinuses situated within the maxilla bones. Shaped like a pyramid, each sinus contains three cavities oriented laterally, medially, and inferiorly. The maxillary sinuses are air-filled spaces within the facial bones.

Functions of the maxillary sinuses include reducing the weight of the skull, contributing to vocal resonance, warming and humidifying inhaled air, and assisting in olfactory function. Due to the close anatomical relationship between the upper teeth and the maxillary sinuses, certain odontogenic infections, odontogenic cysts, and odontogenic tumors may involve the maxillary sinuses.