THE CRANIAL NERVES. 



505 



1374 TABLE OF THE SFNONYMS OF THE CRANIAL NERVES. 



1375. Designation of the Cranial Nerves by Numbers. 

 Among the older anatomists (as may be seen from Vicq d' Azyr, A, 

 "Explication," 48-50), the cranial nerves were variously enume- 

 rated. At the present day only two methods are commonly em- 

 ployed, those of Sommering and Willis. As indicated upon the 

 accompanying Table, the difference between these two concerns only 

 half of the twelve. The 7th and 8th of Sommering constitute the 

 Portio dura and the Portio mollis of Willis's 7th; the 9th, 10th 

 and llth of Sommering are included in the 8th of Willis, and the 

 12th of the former represents the 9th of the latter. 



Fortunately, the nerve most often concerned in medicine and 

 surgery is the 5th, the seat of toothache and most other forms of 

 facial neuralgia. Upon the whole, it would be better to abandon 

 the use of the numbers altogether and employ only the technical 

 names here given, with, perhaps, the substitution of the shorter 

 word acusticus for auditor ius. Nevertheless, in the Descriptions 

 ( 1380-1391) and in the Table (p. 520), the numerical order is fol- 

 lowed for convenience of reference. 



1376. Arrangement of the Cranial Nerves. These nerves 

 have been variously classified in accordance with physiological or 

 morphological facts and theories. 



The following Table exhibits the provisional physiological 

 arrangement which was outlined by Wyman (34, 40) and has been 

 elaborated by Dalton (A, 447). 



