Lab 18 - Image 9

Bovine skull, dorsal views. 1, extensive frontal sinus; 2, maxillary sinus; 3, palatine sinus; 4, lacrimal bone; 5, maxilla; 6, incisive bone; 7, dorsal surface of skull; 8, cornual process; 9, frontal sinus; 10, extension of the frontal sinus into the cornual process.