SECTION XIX 



THE CEREBELLUM. THE PROTECTIVE MECHAN- 

 ISMS OF THE NERVOUS SYSTEM 



CHAPTER LVII 

 THE CEREBELLUM 



The Structure of the Cerebellum. Anatomists have been accus- 

 tomed to divide this organ into a median lobe or vermis and a right 

 and left lateral lobe, or hemisphere. Bolk, 1 however, does not recog- 



Sulcui prepyram 

 Sulcut pregracilis 



Tonsilla 



Lobulus biventralii 



Lobulvspostero-superior 

 Lobulus semilunarit inferior 

 Lobuluf gracilit posterior 

 Lobulus gracilia anterior 

 Pyramil 



FIG. 351. VIEW or CEREBELLUM FROM BELOW. (J. Symington.) 



Sutcus intragraci: 

 Sulcus poatgracilit 

 Suleut horizontalis maynus 



nize this transverse arrangement, but advocates a division in the 

 anteroposterior direction. Thus, it is stated that the sulcus primarius 

 separates this organ into an anterior and a posterior portion. The 

 former embraces the superior vermis, the monticulus and lobus quad- 

 ratus anterior, while the latter includes the remaining portion of this 

 organ, namely, the lobulus simplex, lobulus medianus posterior (ver- 

 mis inferior) and the lobuli complicati. 



1 Das Cerebellum der Saugetiere, Jena, 1906. 

 706 



