594 



THE NERVOUS SYSTEM 



n 



IV 



. .Tangential fibers (Vic 

 d'Azyr's ribbon) 



.Striae of Bechterew 



. Superradiary network (of 

 the second and third layers) 



. . Striae of Baillarger 



. . Intermediary network (of 

 the third and fourth layers) 



. .Meynert's intracortical asso- 

 ciation fibers 



. . Subcortical association fibers 



FIG. 397. FIG. 398. 



FIG. 397. Schematic Diagram of the Different Layers of the Cerebral Cortex. (After 

 Ramon y Cajal.) I, II, III, and IV, Layers of cortical cells. M, Molecular layer; pPy, 

 layer of small pyramidal cells; gPy, layer of large pyramidal cells; Pm, layer of poly- 

 morphous cells. 



FIG. 398. Schematic Diagram Showing the Arrangement of the Nerve Fibers in the 

 Cerebral Cortex. The dotted lines separate the four cellular layers of Cajal. Sb, White 

 substance. 



