OPKNINGS INTO THE NASAL CAVITY. 



Frontal air sinus. 



Sphenoidal air 

 sinus. 



Aperture of nasal duct / 

 into inferior nieatus. 



Cut margin 

 of lower 

 turbinate. 



FIG. 42. Dissection to show openings into the nasal cavity. (After Edward Taylor.) 



[To face page 303. 



