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THE CRANIAL NERVES OF AMPHIBIA. 



A CONTRIBUTION TO THE MORPHOLOGY OF THE VERTE- 

 BRATE NERVOUS SYSTEM. 



OLIVER S. STRONG. 

 Columbia College. 



ANALYSIS OF CONTENTS. 



PAGE 



Introduction loi 



I. Technique 103 



IL Detailed Description of the Nerves and Their Components 106 



1. Trigetninus 107 



2. Facialis and Acusticus 112 



3. Glossopharyngeus and Vagus 135 



4. Sympathetic 150 



5. Recapitulation of nerve components 151 



III. Comparative Morphology of Components 153 



1. General cutaneous 153 



2. Special cutaneous or lateral line 158 



(a) Amphibia 158 



{b) Fishes 166 



(r) Resume 178 



3. Fasciculus Communis 180 



{a) Amphibia 180 



{b) Higher Vertebrates 185 



{c) Fishes 188 



4. Motor 197 



5. Comparison with Cyclostomes 198 



IV. General Considerations 201 



1. Relation of Cranial and Spinal Nerves 201 



2. Relations of the Pre- and Post-Auditory Nerves 206 



3. Bearings upon the Classif cation attd Segmentation of the Nerves.... 208 

 V. Appendix on Technique 211 



Introduction. 



This research may be regarded as, in a manner, a continua- 

 tion of Professor Osborn's work on the Amphibian brain. In 

 the introduction to his paper, '' A Contribution to the Internal 

 Structure of the Amphibian Brain" (Journ. of Morph., Vol. 



