THE CEREBRAL HEMISPHERES 



157 



rat has been investigated by both anatomical and 

 physiological methods, and we shall next pass in re- 

 view some of these facts. 



Fig. 38. — A, Lateral aspect of the cerebral hemisphere of the rat, 

 showing the arrangement of the structurally distinct cortical areas. The 

 rhinic fissure is marked F.R. By Dorsal aspect of the same cerebral hemi- 

 sphere. After Fortuyn (1914). 



Figure 38 illustrates the general form of the cere- 

 bral hemisphere of the rat. As compared with the 

 marsupials already figured the difference which is 

 most significant for our purpose is the greater extent, 



