| (antrum of Highmore, maxillary antrum), a large pyramidal cavity within the body of the maxilla. Its walls are thin and correspond to the orbital, nasal anterior, and infratemporal surfaces of the body of the maxilla. On dental radiographs the floor of the sinus is often observed approximating the root apices of the teeth and is seen to extend from the canine or premolar region posteriorly to the molar or tuberosity region. |