120 The Corpus Ponto-Bulbare 
Pal method; the intermediate ones, for purpose of cell study, were 
stained by various cell stains, thionin having proved most satisfactory. 
A wax-plate reconstruction after the method of Born was made from 
this series showing the ponto-bulbar body and its relations to the 
adjacent cranial nerves, the ecchlear nuclei, the trapezoid body, and the 
restiform body. A composite drawing of this model showing its relations 
to the surrounding region is represented in Fig. 12. 
Through the kindness of Prof. Franklin P. Mall and Dr. Florence 
R. Sabin, I had the opportunity of making a macroscopical examination 
of fifty brains fixed in formalin, a description of which is included in 
Fic. 1. Photograph of a human medulla with a well-marked corpus ponto- 
bulbare (c), transverse sections of which are represented in Figs. 3-11. Fig. 
12 represents the same medulla reconstructed into a model and drawn in 
ventro-lateral view. X 2. 
this paper. They also piaced at my disposal several series of both adult 
and new-born medullas which were valuable as a.control over my own 
series. For these and many other courtesies on their part I take pleasure 
in using this opportunity to express my thanks. 
Gross APPEARANCE. 
The structure, which I have designated as the corpus ponto-bulbare, 
constitutes a horn-shaped process of the pons which extends caudally, 
wrapping around the lateral side of the restiform body so as to end on 
its dorsal surface; forming, in part, the lateral boundary of the fourth 
ventricle. If one takes a brain from which the pia mater has been 
