THE NERVOUS SYSTEM OF MAN. 



39 



The italicized are the basic parts, the others being out- 

 growths. 



( Olfactory lobes. 



Forebrain 3 Cerebrum. 



( Thalamus. 



Midbrain Optic lobes. 



[ Medulla. 



Hindbrain 3 Cerebellum. 



( Pons. 



See also the strange upward and downward growths 

 from the thalamus. These are the pituitary (pi) and the 

 pineal (pn) glands. We shall speak of these again. 



Fig. 26. 



The Distinctive Functions of these Parts. — We 



determine the functions of these several parts partly by 

 observation of injury or disease affecting them in case 

 of man, but mainly by removal of them in case of the 

 lower animals. 



Cerebrum. — For example, if the cerebrum be removed 

 from the brain of pigeons, the bird continues to live, but 



