author's abstract of thls paper 

 issued by the bibliographic service 



APPLICATION OF THE MARCHI METHOD TO THE 



STUDY OF THE RADIX MESENCEPHALICA 



TRIGEMINI IN THE GUINEA-PIG 



WILLIAM F. ALLEN 



Department of Anatonuj of the University of Oregon Medical School, Portland, 



Oregon 



THIRTY-FIVE FIGURES 



CONTENTS 



Introductory " 169 



Review of the literature 171 



Ascending sensory fibers in the mesencephalic root 176 



1. Experiments 176 



Operations , 176 



Microscopical technique 178 



2. Results 179 



Descending fibers in the mesencephalic root 182 



1. Distribution of the nervus trigeminus in the guinea-pig 182 



2. Experiments 185 



3. Results 187 



Neurons of the mesencephalic root 196 



General summary, discussion, and conclusions 197 



Literature 202 



INTRODUCTORY 



A little over a year ago I attended an autopsy of a little 

 girl who died from a large glioma which involved most of the 

 right side and a large part of the left side of the pons. Dr. 

 Lawrence Selling had charge of the case and gave a very com- 

 plete and accurate history. It seems that the growth of this 

 tumor was most rapid, not more than six weeks, and a much 

 shorter time was consumed since the trigeminal nerve was 

 affected; so that secondary degeneration could not have been a 

 factor in the disintegration of the mesencephalic root. The tumor 



169 



