148 



TOPOGRAPHICAL ANATOMY OF THE 



the septal mucous membrane, ami so obtain a view of the interior of the 

 nasal cavity. 



5W 





^ m 



rn i- 



to 

 2 



Each nasal cavity is narrow and elongated, with a dorsal boundary 

 or roof formed by the nasal and frontal bones ; while the palatine, 

 maxillary and incisive bones enter into the composition of the some- 



