92 LABORATORY EXERCISES. 



brain? Does the pia mater have any 

 blood-vessels? 



B. Fore-brain. 



1. Describe the form of the two large masses 



(the cerebral hemispheres) that consti- 

 tute the principal portion of the fore- 

 brain. 



2. Where are the cerebral hemispheres at- 



tached to each other? (The groove be- 

 tween them is called the longitudinal fis- 

 sure.) 



3. What is the appearance of the dorsal sur- 



face of the fore-brain? (The elevations 

 are called convolutions, the grooves be- 

 tween them, fissures.) 



4. Near the anterior end of the ventral sur- 



face of the brain notice two small masses. 

 (These are the olfactory lobes, which 

 connect with the nose region.) Describe 

 their form. 



5. Moisten the section made in the lower por- 



tion of one of the cerebral hemispheres 

 and examine it. Distinguish gray and 

 white matter. Where is gray matter 

 found and where is the white matter? 



6. Note the cavity in the hemispheres. What 



is its shape and size? 



C. Hind-brain. 



i. What is the form of the enlargement (the 

 cerebellum) on the dorsal surface of the 

 brain posterior to the cerebral hemi- 

 spheres? 



