CONTRIBUTIONS FROM THE ZOOLOGICAL LABORATORY OF THE 

 MUSEUM OF COMPARATIVE ZOOLOGY AT HARVARD COLLEGE, 

 UNDER THE DIRECTION OF E. L. MARK. — No. 113. 



No. 11. — PERIPHERAL DISTRIBUTION OF THE CRANIAL 

 NERVES OF SPELERPES BILINEATUS. 



By Mary A. Bowers. 



Presented by E. L. Mark, June 14, 1899. Received August 20, 1900. 



Contents. 



A. Introduction 



15. Methods 



C. Eye-muscle Nerves, III., IV., and VI. 



The Oculomotor 



The Trochlearis 



The Abducens 



D. Trigeminus 



1. Roots 



2. Branches 



a. R. ophthalmicus trigemini 



b. R. maxillaris trigemini . . . 



c. R. mandibularis trigemini . . 



E. Faciahs and Acusticus 



Roots 



Brandies 



a. Ophthalmicus superficialis VII. . 



b. Buccalis VII 



c. Acusticus 



(I. Palatine 



e. R. mandibularis internus VII. 



(r. alveolaris) 



179 



180 

 181 

 181 

 181 

 181 

 182 

 182 

 183 

 183 

 184 

 184 

 185 

 185 

 185 

 185 

 185 

 186 

 186 



186 



/. R. mandibularis externus VII. 



(r. mentalis) 18G 



g. R. hyomandibularis VII. . . . 187 



h. R. hyoideus 188 



F. Glossopharyngeus and Vagus .... 188 



1 Roots 188 



2. Branches 189 



a. R. lateralis 189 



b. R. supratemporalis 189 



c. R. auricularis 189 



d. R. communicans IX. ad VII. . 190 



e. R. pharyngeus 190 



/. R. lingualis IX 190 



g. R. branchialis 190 



h. R. visceralis vagi 191 



Q. First and Second Spinal Nerves . . • 191 



1. First spinal 191 



2. Second spinal 191 



a. Hypoglossus 191 



A. Introduction. 



The study of the distribution of the cranial nerves of Spelerpes biline- 

 atus. was undertaken merely as introductory to an intended investigation 

 of the central origin of the nerves ; but it has seemed advisable to make 

 this study more careful and detailed than was at first contemplated, and 

 as a result the nerve roots have as yet been but superficially examined. 



By studying the " components " of the individual nerves, following in 



