98 PHYSIOLOGY FOE THE LAB OB A TORY. 



(2) The fissure of Sylvius is on the lateral sur- 



face of the hemisphere. It begins about 

 one third the distance from the anterior 

 to the posterior end and runs upward 

 and backward. 



(3) The fissure of Rolando begins at the median 



fissure on the dorsal surface of the brain 

 and runs downward and forward in front 

 of the fissure of Sylvius. 



(4) The parieto-occipital fissure also begins at 



the median fissure, but posterior to the 

 fissure of Rolando, and runs across the 

 hemisphere. 



4. Find the lobes resulting from these fissures. 



(1) The frontal -lobe is at the anterior part of 



the brain. 



(2) The occipital lobe is at the posterior part. 



(3) The parietal lobe lies between the two along 



the median line. 



(4) The temporal lobe is on the side below the 



fissure of Sylvius. How many convo- 

 lutions are there in each lobe? 



5. The olfactory lobes are the two small elongated 



lobes on the ventral surface of the hemi- 

 spheres at the anterior end. 



b. The hind-brain. 



l. The cerebellum. 



(1) Its shape. It consists of a central and 

 two lateral parts. 



