518 



THE NEKVOUS SYSTEM 



narrowest possible rim of cytoplasm. From the cytoplasm of 

 each cell a few short and slender dendrites and a very fine neu- 

 raxis are given off. The dendrites interlace among the neigh- 

 boring cells of the granular layer. The neuraxes pass outward to 

 the molecular layer, in the middle and outer portion of which they 

 divide, in a T-like manner, to form two terminal branches which 

 are distributed in the long axis of the cerebellar convolution. 



Many glia cells also occur in the granular stratum, their radi- 

 ating fibres extending through the entire depth of the layer. This 

 stratum is penetrated by the neuraxes of the Purkinje cells on 

 their way to the medulla, and by nerve fibres coming from the 

 medulla which lose their medullary sheath on entering the granu- 



FIG. 401. A PURKINJE CELL FROM THE HUMAN CEREBELLAR CORTEX. 

 Moderately magnified. Photo. (After Berkley.) 



lar layer, and terminate by end brushes in relation either to the 

 granule cells or to the cells of Purkinje. 



The granular layer is thickest at the apex of the convolution, 

 and thinnest opposite the bottom of the sulci. This peculiarity ap- 

 parently results from the infolding of the cortex in the course of 

 that portion of its development during which the sulci are formed. 



