THE NERVOUS SYSTEM 



1369 



prolonged for a limited distance round the anterior part of the 

 hemisphere in the region of the incisura semilunaris. 



The anterior crescentic lobule is continuous with the culmen 

 monticuli, and represents the anterior subdivision of the upper 

 surface of the cerebellar hemisphere. It is limited posteriorly by 

 a cur\'ed sulcus, called the antero-superior fissure, which is continuous 

 with the freclival fissure, and opens at the circmnference into the 

 great horizontal fissure. The right and left anterior crescentic 

 lobules, together with the culmen monticuli, form the lobus 

 culminis. 



The posterior crescentic lobule is continuous with the clivus 

 monticuli. It is limited in front by the antero-superior firssure, 

 and behind by the postero-superior fissure, the latter being con- 

 tinuous with the postclival fissure, and opening at the circumference 

 into the great horizontal fissure. The right and left posterior 



Medullary Portion of Floor of 

 Fourth Ventricle 



Medulla ObkwgaU (raised) 



, Nodule 



Inferior MednOaxy 

 Velum 



Amygdala 

 (part o<) 



Infoior Semilunar Lobule 



Tuber VaU-ulse 



Pyramid 



Furrowed Band 



Fig. 573. — The Cerebellum (Inferior View). 



(The Inferior Semilunar Lobule and the Lobulus GraciUs together 

 constitute the Postero-inferior Lobule). 



crescentic lobules, together with the clivus monticuh, form the 

 lobus clivi. 



The postero-superior lobule (superior semilimar lobule) corre- 

 sponds to, but is much more extensive than, the fohum cacuminis. 

 It is limited in front by the postero-superior fissure, and behind 

 by the great horizontal fissure. The right and left postero-superior 

 lobules, together with the fohum cacuminis, form the lobus (»cu- 

 minis. 



Under Surface of the Cerebellum. — The under surface presents 

 in the median line a deep groove, called the vallecula, which is con- 

 tinuous behind with the posterior notch. Anteriorly it lodges 

 the medulla oblongata, and lying in the bottom of it there is the 

 lower part of the vermis, which is known as the inferior vermis. 



