94 CHARLES BROOKOVER 



fundus nerve outside the cranial cavity. However, some of the 

 cells are only half as large as others and the smallest are about the 

 size of the cells of the nervus terminalis. 



The fibers that enter the cranial cavity arise from the ramus 

 ophthalmicus superficialis trigemini where the latter is joined by 

 a portion of the profundus nerve as it extends forward from its 

 main ganglion (Allis, '97, plate xxx, fig. 39, opt). From Weigert 

 sections it seems pretty certain that most, if not all, of the fibers 

 that enter the cranial cavity arise from the profundus nerve. 

 As the profundus nerve furnishes a connection between the pos- 

 terior part of the sympathetic system and the ciliary ganglion, 

 it may well establish a connection from the sympathetic system 



Fig. 26. A portion of the ganglion cells from point b in fig. 25. Camera drawing 

 from the most crowded portion of the ganglion, the meninges being mounted with- 

 out sectioning. Shows sheath cells around the nerve cells and Nissl bodies within. 

 X 200. 



to the cells inside the cranial cavity, and to the nervus terminalis. 

 It may be said here, that there are nerve cells along the profundus 

 nerve up to the point where it joins the ramus ophthalmicus 

 superficialis trigemini and sends its fibers into the cranial cavity. 

 Also, in Weigert preparations the profundus nerve was found to 

 send fibers into the trochlear nerve as it passes near (fig. 25). 



An interesting question arises as to the origin of the nerve cells 

 within the cranial cavity of adult Amia. Total mounts of the 

 nerve did not always show the cells and when found, they are 

 quite variable in number. Moreover, it appears that the nerve 

 fibers as well as the cells are sometimes asymmetrical as regards 

 the two sides. In the cases noted there was greater development 



