516 



CEREBELLUM. 



Superiorly, the median portion or npper vermiform process, though 

 slightly elevated, is not marked off from the hemispheres, so that the 

 general surface of the organ, which is here inclined and flattened on 

 each side, is uninterrupted. Below, the hemispheres are convex, and 

 are separated by a deep fossa, named the vallecula, which is continuous 

 with the notch behind, and in which the inferior vermiform process 

 (fig. 361, 2, 2 ; fig. 362, ciju) lies concealed in a great measure by the 

 surrou4iding parts. Into this hollow the medulla oblongata is received 

 in front, and the falx cerebelli behind. 



The peduncles are named superior, middle, and inferior, and connect 

 the hemispheres of the cerebellum with the brain, spinal cord, and with 

 each other. 



The superior peduncles (fig. 358, 5), crura ad cerebrum or processus 

 ad testes, together with the valve of Vieussens, a lamina stretched 

 between them, connect the cerebellum with the cerebrum. 



The inferior pedunrles (fig. 358, 3), crura ad medullam, are the upper 

 extremities of the restiform bodies. 



The middle peduncles (fig. 361, 8), or crura ad pontem, much 

 the largest, are the lateral extremities of the transverse fibres of the 

 pons Varolii. They connect together the two halves of the cerebellum 

 inferiorly. 



All these peduncles pass into the interior of the cerebellum at its 

 fore part. 



Folia. — Tlie cerebellum, at the surface, and for some depth, consists 

 of numerous nearly parallel lamin[e or folia, which are composed of grey 



Ficc. 361. 



Fig. 361. — Infeiuor Surface of the Cerebellum -with the Pons Varolii and 

 Medulla Oblongata (from Sappey after Hirsclifeld and Leveill^). | 



1, placed in the notch between the cerebellar hemispheres, is below the inferior 

 vermiform process ; 2, 2, median depression or vallecula ; 3, 3, 3, the biventral, slender, 

 and posterior inferior lobules of the hemisphere ; 4, the amygdala ; 5, flocculus or sub- 

 peduncular lobule ; 6, pons Varolii ; 7, its median groove ; 8, middle peduncle of the 

 oerebellum ; 9, medulla oblongata ; 10, 11, anterior part of the great horizontal fissure ; 

 12, 13, smaller and greater roots of the fifth pair of nerves ; 14, sixth pair ; 15, facial 

 nerve ; 16, jwrs intermedia ; 17, auditory nerve ; 18, glosso-pharyngeal ; 19, pneumo- 

 gastric ; 20, spinal .acccssoiy ; 21, hypoglossal uerve. 



