Mr. Shaw o/i the Facial Nerves. 121 



produced on the human countenance in palsy depend upon the 

 set of nerves affected, and that the two systems of nerves are 

 seldom or never paralyzed at the same time. 



It will also, by the description of the same cases, be proved 

 that if those actions which are regulated by the set of nerves 

 unaffected, be excited, the distortion of the countenance, caused 

 by the paralysis of the other, will disappear during the excite- 

 ment. 



The first example will be of paralysis of those actions of the 

 muscles which are governed by the portio dura, or respiratory 

 nerve of the face. The next will be of a case of common palsy, 

 or hemiplegia, after apoplexy, in whicli the branches of the 

 5th pair are the only nerves of the face affected. 



To these will be added the description of a very uncommon 

 case, where, in consequence of injury to both sets of nerves, 

 there was double or total paralysis of one side of the face. A 

 slight sketch of several cases will then be offered, to prove 

 what was also advanced in my last communication, " that by a 

 knowledge of these facts, it may be expected, we shall not only 

 be able to form a more correct diagnosis of the nature and seat 

 of palsy than heretofore, but also to estimate the degree of 

 danger attending each class of symptoms. 



Case of complete Paralysis of those Actions of the Muscles of the 

 Face, which are regulated by one of the Nerves of the super- 

 added or additional system, viz., the Portio Dura, or Respira- 

 tory Nerve of the Face. 



Rebecca Larkin, aged 12, daughter of a marble-cutter in 

 Cirencester-place. — This is a pretty little girl, in full health, 

 and, according to her mother's account, is a good scholar, and 

 an adept at her needle. When she is not speaking or smiling 

 there is nothing remarkable in her countenance ; but when she 

 laughs, her face is much distorted, in consequence of the muscles 

 of the left side only, being in action. The cause of theparalysis 

 in the muscles of the right side is rather obscure. The mother's 

 account is, that when the girl was about two years' old, she 

 was taken suddenly ill, and lost the use of her limbs, but that 



