THE CEREBELLUM. 



687 



posterior vermiform process ; an inferior face, studded in some points with 

 small vascular loops ; a base fixed to the vermis, near the free extremity of that 

 prominence, and to its lateral parts ; two lateral borders, attached to the 

 corpora restiformia on each side of the calamus scriptorius ; and a summit 

 corresponding to the receding angle of the excavation. This lamina is, 

 doubtless, nothing more than a septum formed by the external pia mater, 

 and on which is extended the internal membrane that covers the walls of 

 the cerebellar ventricle. Otherwise, it is in direct continuity, towards its base, 

 with an evident dependency of the pia mater the plexus choroides. 1 



g 



Lateral lobes (Fig. 321, 3, 3). These are shaped like two irregular 

 segments of a sphere. Their surface, fissured and lobulated in every .direction, 

 presents nothing interesting externally, superiorly, or posteriorly. It is by 

 1 This septum is represented in the rudimentary state in Man, by the vavultf Tarini. 



