74 



CHARLES BROOKOVER 



or four cells were found anterior to the cranial cavity at the level 

 of the eye-muscle canal of Allis. They are located ventro- 

 medianly between the two main rami of the olfactory nerve 

 (fig. 10), but are more intimately associated with the median 

 bundle. Fig. 10 may be taken as a typical cross-section of the ol- 

 factory nerve in this stage at any point anterior to the cranial 

 cavity. In nearly every section across the region of the nasal 

 capsules, from one to four ganglion cells may be found in the 

 wedge between the two rami of the olfactory nerve. This is 



lateral ramus 



Fig. 10. Transverse section of olfactory nerve and nervus terminalis at level 

 of the eye-muscle canal from Weigert preparation of young Amia 100 mm. long. 

 Two ganglion cells show in the ventro-median wedge representing the nervus 

 terminalis which is more intimately united with the median ramus of the olfac- 

 tory nerve. X 210. 



the portion which Allis ('97) denominated the nerve "n" of 

 Pinkus. The fibers of this wedge, which is only occasionally 

 slightly separated from the median bundle of the olfactory nerve 

 by a few connective tissue fibers, show no trace of medullary sub- 

 stance. It appears similar to the olfactory nerve proper and can- 

 not be traced in the series of sections except by its position and 

 the presence of the ganglion cells. Allis has well said that there 

 is interchange of fibers between the three bundles of the olfac- 

 tory nerve. 



