Mr. Shaw on Ihe Facial Nerves. 123 



The circumstances already detailed are sufficient to prove 

 that the same muscles of the mouth, that were paralytic in those 

 actions which are subservient to expression and respiration, 

 were perfect in any voluntary action. The degree of sensibility 

 in the two cheeks was exactly the same, which was the only 

 additional circumstance necessary to shew that the 5th nerve 

 was perfect in all respects, on the lower part of the right side 

 of the face. 



I next examined the state of the nose. When ammonia was 

 held to the nostrils she inhaled it only with the left ; the irrita- 

 tion caused by the fumes was followed by all the symptoms of 

 sneezing, but the expression was confined to the left side of the 

 face. The left nostril was then closed, and the ammonia held 

 to the right, but she could not snuff it up, nor was there 

 the slightest symptom of sneezing produced, though the 

 fumes of the ammonja were so strong as to make her eyes 

 ■water. 



This was so similar to the experiment on the ass, that I 

 thought it a conclusive proof of the respiratory actions of the 

 muscles of the right nostril being destroyed. To try the 

 power of the branches of the 5th over this division of the nose, 

 I tickled the inside of the same nostril with a feather, and then 

 all the symptoms of being about to sneeze, were produced on the 

 opposite side of the face. 



On examining the state of the eyelids, I found that the orbicu- 

 laris oculi of the right side was much weaker than the left ; it 

 appeared wasted, and this probably from want of use, as she 

 cannot exert it as she does the other, nor is there any action 

 observed in it, when she sneezes or laughs. 



I should, however, state, that though she cannot frown nor knit 

 the brows on this side, in unison with those of the other ; still she 

 has a certain power over the muscles of her forehead, but appa- 

 rently analogous to the same action by which she attempts to 

 laugh with the right cheek, nor can she close the eyelid when 

 she is startled, all of which I may presume are in consequence of 

 the diseased state of the portio dura, since the symptoms in 



