THE NERVOUS SYSTEM. 97 



/. The corpora quadrigemina are situated on the dorsal 

 side. Gently press backward the cerebellum and look 

 forward under the cerebrum for them. 



1. How many parts are there? 



2. What is their shape ? 



3. Are they all of the same size ? e and / are in 



the mid-brain. 



g. Sketch larger than life-size a dorsal, a ventral, and a 

 lateral view of the entire brain, showing the exact relation 

 of the parts, and label each. 



IV. A DETAILED STUDY OF THE PARTS OF THE 

 BRAIN. 



a. The cerebrum, or fore-brain. 



1. The two cerebral hemispheres, the right and the 



left. 



(1) Their general shape. 



(2) How are they separated? 



(3) How are they connected? 



2. The irregular swellings are called convolutions. 



(1) Is there any definite arrangement ? Com- 

 pare the two sides of the same specimen, 

 and then compare your specimen with 

 another. 



3. The fissures are the depressions between the 



convolutions. Locate the principal fissures 

 on each hemisphere. 



(1) The median fissure lies between the two 

 hemispheres. 



