THE CEREBRAL CORTEX. 



419 



cells, but may be met with here and there in the layers of the small 

 and large pyramidal cells. The dendrites of the cells of Qolgi are 

 projected in all directions, those in the neighborhood of the medul- 

 lary substance even penetrating into this layer. The neuraxes 

 break up into numerous collaterals, the telodendria of which lie ad- 

 jacent to the neighboring ganglion cells. The cells of Martinotti, 

 which, as we have seen, occur also in the second and third layers, 

 are either triangular or spindle-shaped. The neuraxis of each cell 

 originates either from the cell-body or from one of its dendrites, and 



Brush-like teloclendrion. 



Main dendrite. - 



Secondary dendrite. . ~ 



Basal dendrite. -^~* 



Neuraxis with collaterals. 



Fig. 33$. Large pyramidal cell from the human cerebral cortex. 



method ; X 1 S- 



Chrome-silver 



ascends (giving off collaterals) to the molecular layer, in which it 

 finally divides into two or three main branches ending in telo- 

 dendria. Occasionally it divides in a similar manner in the layer 

 of small pyramidal cells. 



In the medullary substance the following four classes of fibers 

 are recognized : (i) The projection fibers (centrifugal) i. e., those 

 which indirectly connect the elements of the cerebral cortex with the 

 periphery of the body ; their course may or may not be interrupted 



