490 PHYSIOLOGY 



granular layer is sensory, while the polymorphous layer presides over 

 the lowest cortical functions, such as those concerned in the getting of 

 food, the sexual instincts, and so on. 



The description given above applies to the whole of the neopallium. 

 In the more primitive part of the brain, the archipallium, represented 

 by the hippocampus, we find only two cell laminae which are homolo- 

 gous with the middle (granule) and the inner polymorphous cell layers 

 of the neopallium. 



