502 



COMPARATIVE ANATOMY 



by a longitudinal groove into a dorsal and ventral half, and by the fissure- 

 like ventricle into median and lateral walls. The septum is the ventral 

 division of the median wall, and the primary hippocampus or archipallium 

 the dorsal. In the lateral wall, the striatum is ventral and the paleopal- 



GOLGI CELLS 



TYPE n _ 



ASSOCIATION / J 



NEURONES 



CELL OF 

 MARTI NOTTI 



NEURITES 



CENTR I PETAL 

 FIBER 



COLLATERALS-^ 



A B C 



Fig. 417. — The histological structure of the motor area of the cerebral cortex, 

 showing the different effects of three methods of staining (A, B, C). In A is shown 

 the effect of the use of the Golgi method; in B that of the Weigert method; in C that of 

 hematein and eosin. I to V indicate the five layers of neurons characteristic of mammals 

 in general. (Redrawn from Jordan and Ferguson, after Berkley.) 



lium dorsal. Functionally, the septum is the intermediate station of 

 fibers which pass to or leave the hippocampus. In the amphibian as 

 in the elasmobranch striatum, a ventral and median paleostriatimi and 

 a dorsolateral epistriatimi are differentiated. It is not believed that the 



