author's abstract of this paper issued by 

 the bibliographic service, september 15 



THE MOTOR NUCLEI OF THE CEREBRAL NERVES 

 IN PHYLOGENY. A STUDY OF THE PHE- 

 NOMENA OF NEUROBIOTAXIS 



II. AMPHIBIA 



DAVIDSON BLACK 



From the Central Institute for Brain Research, Amsterdam, Holland, and the 



Anatomical Department, Medical School, Western Reserve University, 



Cleveland, Ohio 



ELEVEN FIGURES 



CONTENTS 



Introductory 380 



Motor roots and nuclei in Rana catesbeana 381 



Second spinal nerve (hypoglossus) 381 



Nerves IX and X 383 



Nerve VII 385 



Nerve VI 387 



Note on the nucleus olivaris superior 388 



Nerve V 389 



Nerves III and IV 390 



Discussion 394 



Hypoglossal complex 394 



Visceral motor nuclei 403 



Mechanics of respiration. . ; 406 



Motor V nucleus 408 



Facial musculature 409 



Aspirator musculature 411 



Inspirator musculature 411 



Hyo-branchial skeleton 412 



Note on the fasciculus solitarius 414 



N. accessorius and m. trapezius 415 



Eye-muscle nerves 420 



Nerve VI 420 



Nerves III and IV 420 



Conclusion 422 



Literature cited 424 



379 



