200 ELEMENTARY PHYSIOLOGY 



olfactory nerve-endings, a sensory impulse is transmitted to the 

 brain, and the sensation of smell is experienced. 



The loss of smell during a cold is sometimes due to the 

 1 



Fig. 183. Section of the Nasal Cavities, seen from behind. 



i. frontal bone ; 3, perpendicular plate of the ethmoid bone ; 4, ethmoidal cavities ; 5, middle 

 turbinated bone 6, inferior turbinated bone ; 7, vomer ; 8, malar or cheek-bone. 



Fig. 184. Nerves of the Septum of the Nose, seen from the right side. 



swollen condition of the mucous membrane surrounding the eth- 

 moidal cavities, by which they are shut off from the common 

 cavity through which the air passes. 



