THE STRUCTURE OF THE CEREBRAL CORTEX 



271 



pyramidal cells which are here widely expanded (see Fig. 8, p. 

 44); others end in dense arborizations which closely envelop 



Fig. 125. Section of the human cerebral cortex from the precentral 

 gyrus (gyrus centralis anterior), illustrating the free endings of the incoming 

 fibers. This region contains a large number of cells similar to those shown 

 in Fig. 124; but none of the cells were stained in this preparation, which was 

 prepared by the method of Golgi. At a and 6 are seen the terminal arbori- 

 zation of two individual fibers. At B is a dense entanglement of such ter- 

 minal arborizations around the cell bodies of the pyramidal neurons of layer 

 3 (Fig. 124). C, D, and E illustrate horizontally directed nerve-fibers, 

 from which the terminal arborizations shown in the upper part of the 

 figure arise. (After Ram6n y Cajal.) 



