What is "maxillary sinus"?

The maxillary sinus, also known as the antrum of Highmore, is the largest of the paranasal sinuses and is located within the maxillary bone of the skull. It is a paired structure, with one sinus on each side of the face. The maxillary sinus is lined with a mucous membrane and is responsible for producing mucus that helps to moisturize and protect the nasal passages. It also helps to lighten the weight of the skull and contributes to the resonance of the voice. The maxillary sinus can be susceptible to infections and inflammation, which can cause symptoms such as pain, congestion, and pressure in the facial area.