532 



THE BRAIN 



end of the anterior notch, and is largely hidden by the culmen. It is a 

 little median mass which is prolonged laterally for a short distance round 

 the semilunar notch in the form of two expansions, termed the a/a. 



Lobus Culminis. The culmen monticuli constitutes the summit or 

 highest part of the monticulus of the vermis. It is prolonged laterally on 

 either side into the corresponding hemisphere as the anterior crescentic 

 lobule. This is the most anterior subdivision on the upper surface of the 

 hemisphere. The two anterior crescentic lobules, with the culmen 

 monticuli, form the lobus culminis cerebelli. 



Lobus Clivi. The declive monticuli lies posterior to the culmen, from 



Central lobule 

 Brachium conjunctivum 



Anterior medullary velum 



Ventricle iv. 

 ' Ala 



Brachium pontis 

 Posterior medullary^ 

 velum v 



Nodule 



Flocculus 



Great horizontal 

 sulcus 

 Inferior semilunar lobule 



Lobulus gracilis \ 



Biventral lobule 



Pyramid 

 Uvula 



Great horizontal 

 sulcus 



'<i Lobulus gracilis 



Biventral lobule 



Tonsil 

 Tuber vermis 



FIG. 224. Lower Surface of the Cerebellum. The tonsil on the right side 

 has been removed so as to display the posterior medullary velum and 

 the furrowed band. 



which it is separated by a distinct fissure, and it forms the sloping part or 

 descent of the monticulus of the vermis. On each side it is continuous 

 with ft& posterior crescentic lobule of the lateral hemisphere, and the three 

 parts are included under the one name of lobus clivi. 



The two crescentic lobules on the upper surface of the hemisphere are 

 frequently described together as the quadrate lobule. 



Lobus Semilunaris Superior ((IT. lobus cacuminis). The folium 

 vermis forms the most posterior part of the superior portion of the 

 vermis, and it bounds the great horizontal fissure, superiorly, at the 

 posterior notch. It is a single folium, the surface of which may be 

 smooth or beset with rudimentary secondary folia, and it is the connecting 

 Jink between the two superior semilunar lobtiles of the hemispheres-- 



