THE PONS AND THE CEREBELLUM. 



133 



2. The general form of the organ, the vermis in the middle 

 and the hemispheres on each side. Both vermis and hemispheres 

 are divided into several good-sized lobes. Those of the vermis 

 are arranged around the central white substance like the fans 

 of a steam-ship's screw. (This is shown in Fig. 81, which rep- 

 resents a sagittal section through the middle of the vermis.) 



The vermis is connected on each side with the white sub- 

 stance of the hemispheres, which is divided into lobes by deep 



FIG. 78. 



The cerebellum. Dorsal surface. 

 Bindearm, Anterior cerebellar peduncles. 



fissures, and into ridges by shallow ones. The dorsal surface of 

 the vermis is called the superior vermiform process. It is divided 

 into 



1. The lingula, far forward between the anterior peduncles. 



2. The lobulus centralis (central lobe). This passes over 

 into the alee lobuli centralis on each side. 



3. The monticulus, of which we call the anterior portion 

 the culmen and the posterior portion the declivity. 



