NERVUS TERMINALIS: MAMMALS 19 



cased within the same connective tissue sheath which surrounds 

 the third, more rostrally situated, vomeronasal bundle. The 

 small strand which fails to reunite with the plexus appeared to 

 have been torn from its course distally along a blood-vessel 

 which passes between the dorsal surface of the olfactory bulb 

 and the cerebral hemisphere. 



Essentially the same relations to the vomeronasal nerves and 

 to the cribriform plate were found in a dissection of a half -grown 

 kitten, not figured. In this specimen the left olfactory bulb was 

 removed, and it was attempted to trace strands of the terminalis 

 into the nasal septum. Six strands which clearly belong to the 

 nervus terminalis were present. Four of these became related 

 to the vomeronasal nerves, and one of these four remained suf- 

 ficiently separated from the dorsal bundle of this nerve so that 

 its course could be followed distinctly through the cribriform 

 plate. Most of the strands became enclosed by the sheaths of 

 the vomeronasal bundles in such a manner that it was not possible 

 to distinguish them from the strands of the latter nerve in their 

 course peripherally by the method of dissection. Two of the 

 strands which passed niore dorsally did not converge with the 

 vomeronasal bundles. One of these passed through one of the 

 more dorsally situated foramina of the cribriform plate, together 

 with a large olfactory bundle, and its course on the nasal septum 

 was traced for some distance. The other continued dorsally and 

 became attached to an artery which lay in the furrow between 

 the olfactory* bulb and the cerebral hemisphere. 



Figure 3, which represents a graphic reconstruction of the 

 terminalis plexus between the vomeronasal nerves and the 

 point where its roots enter the brain, shows essentially the same 

 relations. This figure represents a composite of thirteen sections 

 of the region of the forebrain and nasal septum of a kitten two 

 weeks old, prepared by the pyridin-silver method. It supple- 

 ments figure 1 by showing the finer strands of the plexus to 

 which reference was made, and by bringing out numerous small 

 ganglia which could not be seen in the dissection represented in 

 figure 1. A comparison of figure 3 with figiire 2, which repre- 

 sents an in toto amount of the right nervus terminalis of the same 



