**Maxillary: this is the largest sinus, and consists of the space within the caudolateral part of the upper jaw, above the caudal cheek teeth. This increases with age due to wearing and ventral relocation of the teeth. | **Maxillary: this is the largest sinus, and consists of the space within the caudolateral part of the upper jaw, above the caudal cheek teeth. This increases with age due to wearing and ventral relocation of the teeth. |