THE BRAIN. 



405 





~ d 



from the basal surface of the cell body where also 

 the axone is attached. The latter passes toward 

 the medullary 

 substance, and 

 near the cell 

 body is pro- 

 vided with col- 

 laterals that 

 connect with 

 adjacent neu- 

 rons. 



The layer of 

 large pyramidal 

 cells comprises 

 a broad area. 

 The cells meas- 

 ure 20 p. to 30 fJt 

 in diameter, be- 

 ing twice as 

 large as those 

 of the preced- 

 ing layer. In 

 all other re- 

 spects the cells 

 of this layer re- 

 semble the 

 small pyram- 

 idal cells. 

 Their dendrites 



and axones also occupy the same relation as those 

 of the preceding layer. 



4. The layer of polymorphic cells usually includes 



if--/ 



Fig. 280. Schematic diagram of the cerebral 

 cortex: a, Molecular layer with superficial (tan- 

 gential) fibers; b, striation of Bechtereff-Kaes; 

 c, layer of small pyramidal cells; d t stripe of 

 Baillarger; e, radial bundles of the medullary 

 substance; /, layer of polymorphous cells 

 (Bohm and Davidoff). 



