NERVUS TERMINALIS : MAMMALS 23 



coursed toward that part of the mucosa which lay dorsal to the 

 vomeronasal bundles, where the greater part of the plexus is 

 located. Examination of the figure indicates that many of the 

 nerve strands follow quite closely the paths of the blood-vessels 

 represented by broken lines. Owing to the complexity of the 

 vascular network, only the larger of these vessels were seen 

 clearly enough in the preparations to make it possible to trace 

 their courses. No ganglion cells or small ganglia were seen, 

 but this was laid to the peculiarity of the stain. Silver and Wei- 

 gert preparations revealed the presence of such cells in the nasal 

 septum, but in much smaller mmibers than are indicated in the 

 rabbit by Huber and Guild ('13) or in the human by Brookover 

 ('17). The ganglion clusters are, however, very numerous in- 

 tracranially, especially on the mesial sides of the olfactory bulb. 



While it seems likely that most of the plexus formed by the 

 nervus terminalis on the nasal septum was seen, it is doubtless 

 true that the rostral part of the septum, which unfortunately 

 did not take the stain, also contains a continuation of this plexus. 

 Pyridin-silver preparations indicate this beyond question in the 

 cat, and it has been shown to be true in the rabbit by Huber and 

 Guild, and in the human by Brookover, in the papers above 

 cited. 



The observations of the olfactory region of the mucosa are 

 more dubious. In the methylene-blue preparations, the region 

 in which olfactory fibers were present was stained a diffuse dark 

 blue-green, which made it impossible to see any portion of the 

 plexus if it were present. The pyridin-silver material shows oc- 

 casional fibers in this region which may belong to the nervus 

 terminalis, but this cannot be stated with any degree of certainty. 

 It is possible that they are fibers from the anterior ethmoidal 

 nerve, the main trunk of which lies in close proximity to many 

 of the fibers found. 



So far as the methylene-blue material indicates, there is no 

 connection of the nasal plexus of the terminalis with either the 

 anterior ethmoidal or the nasopalatine branches of the trigemi- 

 nal nerve. The silver preparations, however, showed such a 

 confusion of trigeminal and terminalis fibers in the rostral end 



