CEREBELLUM 531 



other so as to embrace the large brachia pontis (O.T. middle 

 peduncles), where they pass into the interior of the cere- 

 bellum. The great horizontal sulcus divides the cerebellum 

 into an upper and a lower part, which may be studied 

 separately. 



Lobes on the Upper Surface of the Cerebellum. It has been noted 

 already that the upper surface of the vermis superior is subdivided. The 

 divisions commencing from the anterior end are : (i) the lingula ; (2) the 

 central lobule ; (3) the culmen monticuli ; (4) the declive monticuli ; (5) the 

 folium vermis. With the exception of the lingula, each of these is continuous 



Pons 



Mesencephalon 

 ! Central lobule 



Culmen monticuli 



Anterior crescentic lobule 



Posterior crescentic lobule 



Declive monticuli 



Folium vermis 



Superior semilunar 

 lobule 



Inferior semilunar lobule 

 Tuber vermis 



Posterior notch 

 FIG. 223. Upper Surface of the Cerebellum. 



on either side with a corresponding district on the upper surface of the hemi- 

 sphere, and forms with these districts a cerebellar lobe. Thus, the central 

 lobule is prolonged laterally on each side in an expansion called the a/a ; 

 the culmen constitutes a median connecting piece between the two anterior 

 crescentic lobules of the hemispheres ; the declive stands in the same relation 

 to the posterior crescentic lobules ; and the folium vermis is the connecting 

 band between the superior semilunar lobules of the hemispheres. 



Lingula. The lingula can be seen only when the posterior boundary of 

 the anterior notch is pushed posteriorly. It consists of four or five small 

 folia, continuous with the grey matter of the vermis, prolonged anteriorly 

 on the surface of the anterior medullary velum, in the interval between 

 the brachia conjunctiva. 



Lobus Centralis with its Alae. The central lobule lies at the posterior 



