NEEVUS TERMINALIS: MAMMALS 17 



sues surrounding both vessels and nerves. Sections (figs. 3 and 

 23) indicate that the larger strands at least enter the brain inde- 

 pendently of the blood-vessels. 



A fourth strand (r*), which joins the nerve trunk, appears not 

 to enter the brain. This strand was traced caudally for a short 

 distance along the anterior cerebral artery, but became so atten- 

 uated by separating into minute bundles of fibers that it was 

 not possible to follow the divisions far. 



In one of the specimens examined, a kitten one day old, cells 

 similar to ganglion cells were observed along the course of the 

 roots for a little distance within the brain (fig. 23). 



An elongated ganglionic swelling (fig. 1, gn') is shown rostrad 

 to the point where the nerve strand from the anterior cerebral 

 artery unites with the main trunk of the nerve. Further rostrad 

 a larger ganglion (gn) is seen in close proximity to the most cau- 

 dal of the three principal vomero-nasal bundles. 



Between these two ganglionic masses the main trunk of the 

 nerve breaks up into a plexus of nerve strands (a, b, c). Many of 

 these follow the larger blood-vessels of the region and send twigs 

 into their walls. Three of the largest strands of the plexus con- 

 verge distally, uniting with vomeronasal bundles. A number of 

 strands, finer than any represented in the figure were found, but 

 were torn in dissection. They were composed of relatively few 

 fibers each, and uniting with the larger strands, formed a loose 

 plexus over the medial surface of the olfactory bulb, as shown 

 in figure 3. 



The more ventrally located (c) of the larger bundles divides 

 into two strands which unite, one with the ventral bundle of 

 the vomeronasal nerve, the other with a more dorsally located 

 bundle of the same nerve. 



While the three strands (a, b, c), already noted, diverge at 

 various angles from the principal axis of the nerve, the other 

 divisions do not depart so widely. As shown in figure 1 (e), 

 they form a secondary plexus which reunites, with the exception 

 of one small strand, into the ganglionic swelling (gn) already 

 noted. The single bundle which continues rostrally from this 

 ganglion crosses two of the vomeronasal bundles to become en- 



THE JOURNAL OF COMPARATIVE NEUROLOGY, VOL, 30, NO. 1 



