viii THE HIND-BKAIN 423 



bellum is interesting, because it is reasonable, as Bolk showed in 



&' i. 



S.ptr-gr. 





FIG. 222. Views of upper (A) and lower (B) surfaces oT human cerebellum. Xatural size. From 

 photographs. (Schafer.) The plate also shows Bolk's divisions into lobules, in different colours. 

 The light yellow is Bolk's anterior lobe ; dark yellow, simple median lobule on upper surface, 

 and posterior median lobule on lower surface of cerebellum ; the red shows the two lateral 

 lobules which Bolk calls compound of which the deeper red tonsils and flocculi also form 

 part. In A : I.e., lobulus centralis ; a.l.c., ala lobuli centralis ; m, culmen monticuli ; l.m., 

 lobus culminis ; d.,clivus; l.cl., lobus clivi ; l.cac., lobus cacuminis ; Lt., lobus tuberis ; s.p.-c., 

 sulcus post-centralis ; s.pr.-cl., sulcus pre-clivalis ; s.p.-cl., sulcus post-clivalis ; f.h., f.h., fissura 

 horizontalis magna. In B : I, lingula ; I.e., lobus centralis ; a.l.c., ali lobuli centralis ; s.p.-c., 

 sulcus post-centralis ; v.m.s., velum medullare superius ; p.s.c., pedunculus cerebelli superior ; 

 p.c., pedunculi cerebelli medius et inferior ; n., nodulus ; i>.m.i., velum medullare inferius ; p.fl., 

 pedunculus flocculi; /..flocculus; u., uvula; am., amygdala; \py, pyramis ; IMv., lobus 

 biventralis ; t.v., tuber valvulae sen posticum ; l.t., lobus postero-inferior ; l.gr.i, lobulus 

 gracilis anterior ; Z.</r. 2 , lobulus gracilis posterior ; s.pr.-gr., sulcus pre-gracilis ; s.i.-gr., sulcus 

 intra-gracilis ; s.p.-gr., sulcus post-gracilis ; f.h., flssura horizontalis magna. The vallecula has 

 been somewhat opened out to display the parts of the lower worm. 



his masterly work on the Mammalian Cerebellum, 1904-6, by 



2 E i 



