STRUCTURE OF THE CEREBRAL CORTEX 



571 



Besides these cells we find scattered through the cortex a considerable 

 number of the neuroglia cells. The character and position of these are shown 

 in figure 402. 



The general arrangement of the layers of the cortex is described very dif- 

 ferently by the various authors. It is not uniform in the different parts of the 



FIG. 402. The Principal Constituent Elements of the Gray Cortical Layer of the Anterior 

 Cerebrum. (After Ram6n y Cajal.) 



(After Ram6n y Cajal.) 



brain. The simplest and most representative type, however, of the arrangement 

 is that in which the cortex is divided into four layers. The outermost, or super- 

 ficial, known as the molecular layer, contains relatively few cells. It is com- 

 posed of neuroglia tissue, embedded in which are a number of cells of the 

 Cajal types, which have just been described. There are also in this layer 

 many neuroglia cells. In the superficial part of the layer of some areas of the 



