NERVUS TERMINALIS IN MAN 



133 



noid. The nerve bundles take a fairly dii-ect path here and 

 do not seem to be influenced by the course of the vessels. 



When toto mounts and sections of the meninges of the region 

 just mentioned above are studied, it is clear we have a bundle 

 of nerve fibers belonging to the ner\nis terminahs and not a 

 strand of connective tissue. In the first place, the bundle occu- 

 pies a definite position with characteristic method of occasional 

 splitting and reunion of its strands. There is to be found a large 

 number of sheath cells identical with those found in the fila 

 olfactoria and about the cells of the nervus terminahs peripher- 



o\yctoif^ WV\5 



t\ewus\exim\uBiVis 



Aa^rnm^ \exm\n?A\s 

 o^Vvc nerve xe^Vexff^' 



Fig. 1 Outline of the ventral surface of adult human brain, two-fifths natural 

 size, from a rather small brain, to show the position of the central portion of the 

 nervus terminalis and its relation to the olfactory tracts and the gyrus rectus. 



ally. These sheath cells are deeper staining than the adjacent 

 meningeal connective tissue fibers, and the fibrillar appearance 

 of the nerve fibers among them is different from the larger and 

 clearer connective tissue fibers. Perhaps the most conclusive 

 proof that we are here dealing with a nerve and that it is the 

 nervus terminalis, is the presence of ganglion cells so characteris- 

 tic of the nervus terminalis in most, if not all, the vertebrates 

 hitherto described. Two of the cells located posterior to the 

 olfactory bulbs have been sketched in figures 2 and 3. In this 

 region of the nerve they have not been found in greater numbers 



