,---. '7n.rectus mediatls-ysi 

 v^-V- -' ,\ m. obuquiLs // .-'^ 

 rj. opticas--'--,- -J \ «'V'^'^'--%:^V 



./. 'i\ ■■•V" if 



n/7, aUares - 



--n.irl^emlnas 



]:-nn. facialis 

 etacusticus 



-n. abducens 



Fig. 7 Dorsal view of the right orbit. The superior rectus and the superior 

 oblique muscles have been cut. The optic nerve has been cut close to the eye- 

 ball and turned medially so as to show the ciliary nerves on its caudal surface. 

 This drawing shows also a case in which the ventral ramus of the oculomotor nerve 

 is dorsal to the inferior rectus muscle (compare fig. 6). X 15. 



Fig. 8 Dorsal view of the mid-brain and medulla oblongata showing relations 

 of the trochlear nerve. On the left side the most usual relations are shown. On 

 the right side appear the relations in a case in which the nerve was split into two 

 fascicles, the main trunk of the nerve passing caudad over the cerebellar com- 

 missure to the choroid plexus of the fourth ventricle. The dotted lines indicate 

 the edges of the choroid plexus. The connections of the fibers which appear 

 coming from the trochlear nerve to the choroid plexus have not been determined. 



X9. 



172 



