THE BRAIN. 



405 



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- &^^^^^^^'^~i-.-- - 

 laterals that MM^ti^^ ' 

 connect with 

 adjacent neu- 

 rons. 



The layer of 

 large pyramidal 

 cells comprises 

 a broad area. 

 The cells meas- 

 ure 20 fi to 30 /./ 

 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 



111! 



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, stripe of 

 Baillarger; e, radial bundles of the medullary 

 substance; /, layer of polymorphous cells 

 (Bohm and Davidoff). 



