Maxillary sinus (syn)

Antrum of Highmore, maxillary antrum. Air cavity in the body of the maxilla that is lined by the Schneiderian membrane consisting of a pseudostratified ciliated columnar epithelium. It normally lies superior to the roots of the maxillary premolars and molars and generally extends anteroposteriorly from the canine or premolar region to the molar or tuberosity region. Anatomically, it is a pyramidal cavity, with thin bony walls corresponding to the orbital, alveolar (floor), facial, and infratemporal aspects of the maxilla. Its apex extends into the zygomatic process. Its base is medial, forming the lateral wall of the nasal cavity. It communicates with the nasal cavity through an opening in the middle meatus called the ostium. The floor is formed by the maxillary alveolar process and partly by the hard palate. The floor exhibits recesses and depressions in the premolar and molar regions. Each sinus usually has a volume of about 5 mL.


One of a pair of air cells forming a cavity in the maxilla; the mucous membrane lining is continuous with that of the nasal cavity.


A cavity in the maxillary bone communicating with the middle meatus of the nasal cavity.


The sinuses situated in the cheek region beneath the eye, adjacent to the ethmoid sinus.


 


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