Maxillary sinus

Pronunciation

Definition 1

A type of paranasal sinus (a hollow space in the bones around the nose). There are two large maxillary sinuses, one in each of the maxillary bones, which are in the cheek area next to the nose. The maxillary sinuses are lined with cells that make mucus to keep the nose from drying out. (NCI Dictionary)

Definition 2

A pyramidal-shaped, thin-walled, air-filled cavity located in the maxilla. It is lined by mucus membrane and periosteum (mucoperiosteum) which contains cilia. It is adjacent to the nasal cavity and communicates with the middle meatus of the nose. It is the largest paranasal sinus and is composed of three recesses: alveolar, zygomatic, and infraorbital. (NCI Thesaurus)

Definition 3

One of the paired paranasal sinuses, located in the body of the maxilla, communicating with the middle meatus of the nasal cavity. (NLM, Medical Subject Headings)

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