290 



HUMAN ANATOMY. 



the vermis and the hemispheres less intimate. The divisions 

 of the vermis and their corresponding lobules in the hemispheres 

 are as follows: 



Great 



Pre- 



horizontal 

 fissure. 



pyramidal 

 fissure. 



pyramidal 

 fissure. 



nodular 

 fissure. 



horizontal 

 fissure. 



The cerebellum is connected with the encephalon by the 

 peduncles of the cerebellum, three in number., from above down- 

 ward, as follows : 



Superior, or processus e cerebello ad testes, pass to the cere- 

 brum; 



Middle, or processus ad pontem, the transverse fibres of 

 the pons Varolii, connect the hemispheres ; 



Inferior, or processus a cerebello ad medullam, the resti- 

 form bodies of the medulla oblongata, connect with medulla ob- 

 longata. 



The internal structure of the cerebellum consists of an arbor 

 vitae arrangement of gray matter, inclosing a white mass. In 

 the centre of the latter is found a grayish, dentated mass, the 

 corpus dentatum, an irregular capsule of gray matter opening 

 anteriorly. 



THE CEREBRUM 



consists of a large, ovoidal mass, divided into two lateral halves, 

 or hemispheres, by the great longitudinal fissure, connected by 

 a white, transverse commissure the corpus callosum. The sur- 

 face is irregularly marked by convolutions, or gyri, separated 

 from each other by irregular depressions, fissures, or sulci. The 

 outer surface is composed of gray matter, which, from its loca- 

 tion, is called the cortical substance. The interior surface, for 

 the most part, is white. 



