NERVUS TERMINALIS TN DOG AND CAT 



147 



bulb. The nervus terminalis was likewise divided where it en- 

 tered the brain wall. These nerves were then removed from the 

 specimen in one mass and stained in Van Gieson's hematoxylin- 

 picro-fuchsin stain. Figures 3 and 4 represent drawings made 

 from favorable portions of such a preparation. The serial sec- 

 tions used for this study consisted of a transverse series made 

 from the medial half of the olfactory bulb and peduncle of the 

 dog. The sections were stained in hematoxylin and congo red. 



Formotio votTieronflsolis, 



IOtcj vorrieronasalis 



N terroina lis 



Fig. 1 A median section of the head of a dog with the frontal lobe of the 

 brain, the nasal septum and the mandible removed, showing the course and ter- 

 mination of the nervus terminalis and its connection with the vomeronasal nerves. 

 Natural size. 



The relation of these structures as seen in the dissections of 

 the dog are shown in figure 1. The vomeronasal nerves upon 

 passing through the cribriform plate course almost horizontally 

 across the narrow medial aspect of the olfactory bulb to its 

 caudal border where they break up in a fine plexus and turn 

 lateral ward upon the dorsal aspect of the olfactory bulb. Con- 

 nected with this plexus are several small bundles that usually 

 unite into a single trunk which extends caudoventralward on the 



