Plate VI.— Transverse Section across Inferior Extremities of Zygomatic Ridges 



I. Anterior meatus. 2. Anterior turbinated bone. 3. Middle meatus. 4. Inferior 



maxillary sinus. 5. Posterior turbinated bone. 6. Posterior meatus. 7. Ridge between 



the two divisions of the inferior maxillary sinus. 



