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 BILINEATCS. 



By Mary A. Bowers. . 



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



Contexts. 



A. Introduction 



B. 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. Facialis and Acusticus 



1. Roots 



2. Branches 



a. Ophthalmicus superficial VII. . 



b. Buccalis VII 



c. Acusticus 



(I. Palatine 



e. R. mandibularis internus VII. 



(r. alveolaris) 



179 



180 



1-1 



181 



181 



181 



182 



182 



1«3 



183 



184 



184 



185 



185 



185 



1-5 S 



185 



186 



186 



1S6 



/. R. mandibularis externus VII. 



(r. mentalis) 186 



g. R. hyomaudibularis VII. ... 187 



h. R. hyoideus 188 



Glossopharyngeus and Vagus .... 188 



1 Roots 188 



2. Branches 189 



a. R. lateralis 189 



b. R. supratemporalis 189 



c. R. auricularis 189 



(I. R. communicans IX. ad VII 190 



e. R- pharyngeus 190 



/. R. Ungualis IX 190 



g. R. branchialis 190 



h. R. visceralis vagi 191 



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 



