248 



NORMAL HISTOLOGY. 

 FIG. 229. 



Cells of the molecular layer of the cerebral cortex. (R. y Cajal.) A, C, small spindle-shaped 

 cells ; B, small stellate cell ; D, large stellate cell. The branches marked c are neurites. 



FIG. 230. 



FIG. 231, 



Fig. 230. Diagrammatic section through the cerebral cortex. (R. y Cajal.) A, small pyram- 

 idal cell in the second layer ; B, two large pyramidal cells in the third layer ; C, D, poly- 

 morphic cells in the fourth layer ; E, centripetal neurite from distant nerve-centres ; 

 F, collaterals from the white substance ; G, bifurcation of a neurite in the white sub- 

 stance. The arrows indicate the centripetal and centrifugal courses of nerve-impxilses, 

 but it is probable that centripetal impulses have to pass through other neurons (perhaps 

 the spindle-cells of the molecular layer) before they are translated into centrifugal im- 

 pulses. 



Fig. 231. Cells with short neurites in the cerebral cortex. (R. y Cajal.) A, molecular layer ; 

 B, white substance ; a, cells with neurites, which speedily divide into numerous tele- 

 neurites in the neighborhood of the cell belonging to the same neuron ; 6, cell with n 

 neurite extending vertically toward, but not entering, the molecular layer ; c, cell with 

 a neurite distributed within the molecular layer ; d, small pyramidal cell. 



