DISSECTING MANUAL. 



each lateral recess. All choroid plexuses, being covered by 

 ependyma, are really outside the ventricles. [512] 



CEREBELLUM. 



This lies behind the pons and medulla and consists of a me- 

 dian portion (vermis) and two lateral portions (hemispheres). 

 The latter are separated in front and behind by notches (an- 

 terior and posterior notches) ; the posterior notch is the smaller 

 and narrower. Numerous curved and parallel sulci mark the 

 surfaces; the largest sulcus (great longitudinal fissure) begins 

 in front, enclosing the peduncles, runs around the circumfer- 

 ence, and divides the cerebellum into upper and lower parts. 

 The superior surface presents a median ridge (superior vermis, 

 or monticulus cerebelli) which is highest in front; from this it 

 slopes to the margins of the hemispheres. The inferior sur- 

 face presents the convex hemispheres separated by a mesial 

 hollow (vallecula) ; at the bottom of the hollow is a median 

 ridge (vermis inferior) which is separated from the hemisphere 

 on each side by a furrow (sulcus valleculse). [505] 



The longer and deeper furrows divide the vermis and hemi- 

 spheres into lobules. Each lobule of the vermis, except the 

 lingula, is continuous on each side with a corresponding lobule 

 of the hemisphere, and the three lobules together form a lobe. 

 The arrangement of the lobules is as follows, from before 

 backward. 



UPPER SURFACE. 

 Hemisphere. Superior Vermis. 



Lingula 



Alse Central lobule 



Anterior crescentic lobule Culmen monticuli 



Posterior crescentic lobule Clivus monticuli 



Postero-superior lobule Folium cacuminis 



LOWER SURFACE. 

 Hemisphere. Inferior Vermis. 



Flocculus Nodule 



Tonsil Uvula 



Biventral lobule Pyramid 



Postero-inferior lobule Tuber valvulae 



[30] 



