THE CEREBELLUM 



203 



Andre Thomas and Durupt, 1914) and by clinical observations (Barany, 1912). There 

 are, however, good reasons for skepticism regarding his localization of centers for the head 

 and trunk. Ingvar (1918) presents evidence which indicates that the anterior and posterior 

 lobes are probably concerned with the maintenance of the equilibrium of the body as a whole. 

 The middle lobe, on the other hand, contains a number of separate centers, which correspond 

 to those outlined by Bolk, for the control of the musculature of the neck and extremities. 



It has long been known that the degree of development of the cerebellar hemispheres in the 

 different classes of vertebrates is closely correlated with that of the pons and cerebral cortex. 

 This is particularly true of the lobulus ansiformis and lobulus paramedianus, which, like the 

 neopallium, are recent phyletic developments. These belong to what Edinger (1911) calls 



B. N. A. 



Ala lobuli centralis 



Lobulus centralis 



Culmen monticuli 



Pars anterior lobuli 



quadrangular is 



Pars posterior lobuli 



quadrangularis 



Declive monticu'i 



Lobulus semilunaris 



superior 



Lobulus centralis 



Ala lobuli centralis 



Brachium pontis 



Flocculus 



Brachium conjunctivum 



Nodulus 



Uvula 



Tonsilla 



Lobulus biventer 



Pyramis 



Tuber 



Lob. semilun. inf. 



Sulcus horizontalis 



Lobulus semilunaris 



superior 



Fig. 146. 



BOLK 

 Lobus anterior 



Sulcus primarius 

 Lobulus simplex 

 S. postdivalis 

 Lobulus ansiformis 



Lobus anterior 



Cerebellar peduncles (cut) 

 Flocculus 



Sulcus uvulo-nodularis 



Lobulus paramedianus 

 Fissura secunda 



Lobulus ansiformis 



Fig. 147. 



Figs. 146 and 147. Outline drawings of the human cerebellum showing the localization of 

 function according to the theory of Bolk. On the right side the parts are designated according 

 to Bolk's terminology, on the left according to the B. N. A. Fig. 146, dorsal view. Fig. 147, 

 ventral view. (Herrick.) 



the neocerebellum, receive the majority of the fibers from the brachium pontis, and may 

 properly be regarded as cortical dependencies. They take an important part in the co- 

 ordination of the voluntary movements of the extremities. 



THE NUCLEI OF THE CEREBELLUM 



The dentate nucleus is a crumpled, purse-like lamina of gray matter within 

 the massive medullary body of each cerebellar hemisphere (Fig. 148). Like 

 the inferior olivary nucleus, which it closely resembles, it has a white center 

 and a medially placed hilus. In close relation to this hilus lies a plate of gray 

 matter, the emboliform nucleus, and medial to this is the small globose nucleus. 



