THE CEREBELLUM 



889 



The tuberal lobe is of small size in the region of the inferior vermis, but laterally 

 spreads out into the large inferior semilunar (lobulus semilunaris inferior) and 

 gracile lobes demarcated by the intervening postgracile fissure. These lobes com- 

 prise at least two-thirds of the "inferior" surface of the cerebellar hemispheres. 



FIG. 653. Diagram showing fissures on under surface of the cerebellum. F. Flocculus. N. Nodule. 

 17. Uvula. Py. Pyramid. Am. Amygdala or Tonsilla. Bivent. Biventral lobe. 



The gracile lobe is often divided by an intragracile fissure into pre- and post- 

 gracile lobes. 



The pyramidal lobe is a conical projection, forming the largest prominence 

 of the inferior vermis. It is continued laterad into the hemisphere as the biventral 

 lobe (lobuhis biventer); the demarcation between the latter and the pyramis proper 

 is accentuated by the deep sulcus valleculse. 



Anterior 

 crescentic lobe. 



Ala lobull centralis. 



Lingula. 



Superior peduncles 

 of cerebellum. 



Great 

 horizontal 



fissure. 



Slender lobe. 



Amygdala or TunsiUa. Nodule. Fourth ventricle. 



FIG. 654. Sagittal section of the cerebellum, near the junction of the vermis with the hemisphere. 



(Schafer.) 



The uvular lobe (uvula vermis} occupies a considerable portion of the inferior 

 vermis as the uvula, while its lateral extension in either hemisphere, the amygdala 

 or tonsilla (amygdaline nucleus; tonsilla cerebelli], is a rounded mass lying in a deep 

 fossa between the uvula and biventral lobe. (This fossa was termed by the 



