888 



THE NERVE SYSTEM 



I 



rjl 



repeated here. The arrangement of the fissures and lobes will be understood by 

 reference to the following schema, in which structures are named from "before 

 backward," or cephalocaudad : 



VERSUS. HESIISPHERE. 



'. Lingula. Vincula lingualae. 



< Precentral Fissure. > 

 ; Lobulus centralis. Ala lobuli centralis. 



< ' Postcentral Fissure. 5* 



Culmen monticuli. Anterior crescentic lobe. 1 



< Preclival Fissure. ;> 



Clivus monticuli. Posterior crescentic lobe. 



< Postclival Fissure. > 



Folium cacuminis. Superior semilunar lobe. 



< Peduncular Fissure. > 



r ( Inferior semilunar lobe. ") 



Tuber vermis. -I < Postgracile fissure. > \ Postero-inferior lobule. 



(Gracile lobe. J 



<- Postpyramidal Fissure. > 



Pyramis. Biventral lobe. 



< Prepyramidal Fissure. > 



Uvula. Tonsilla (Amygdala). 



<, Postnodular Fissure. > 

 Nodulus. Flocculus. 



The lingula (lingula cerebell'i) is a tongue-shaped process of the vermis lying in 

 the ventral cerebellar notch, ventrad of the central lobe, and is partially or com- 

 pletely concealed by it. It consists of five, six, or seven lamellae lying upon and 

 connected with the dorsum of the valvula. At either side the lingula gradually 

 shades off, being prolonged only for a short distance toward the region of the 

 peduncles as the vincula lingulae. 



The central lobe (lobulus centralis} is a small median mass situated in the ventral 

 notch, dorsad of and overlapping the lingula. Its lateral, wing-like prolongation 

 is called the ala lobuli centralis. 



The culminal lobe is much larger than the two' lobes just described, and con- 

 stitutes, with the succeeding lobe (the clival lobe), the bulk of the superior vermis 

 and "upper" surface of the cerebellum. It partly overlaps the central lobe. Its 

 lateral extensions are also termed the anterior crescentic lobes. 



The clival lobe is of considerable size, separated from the culminal lobe by 

 the preclival fissure and from the cacuminal lobe by the postclival fissure. Its 

 lateral extensions are also termed the posterior crescentic lobes. 



The anterior and posterior crescentic lobes of either side have been described 

 by some writers as the pars anterior and pars posterior of the quadrate lobe or lobulus 

 quadrangularis. 



The cacuminal lobe (folium vermis; superior semilunar lobe] is a short, narrow 

 band at the dorsal margin of the vermis, which expands in either hemisphere 

 into a lobe of considerable size, of semilunar shape, and bounded caudad by the 

 peduncular fissure. 



1 The anterior and posterior crescehtic lobes are often called the pars anterior and pars posterior, respectively, 

 of the "lobulus quadrangularis." 



