LECTURES ON THE CENTRAL NERVOUS SYSTEM. 



cut) of very fine mcclullatcd 

 fibres. Not until we pass this" 

 layer of neuroglia do we meet ;/ 

 with the real ganglion-cells of 

 the cortex. They all have a 

 more or less clearly defined 

 pyramidal shape, and send 

 apex processes, lateral proc- 

 esses, and axis-cylinders. The 

 location and appearance of the 

 first two are made clear in the 

 cut, but it is more difficult to 

 recognize that process which 

 becomes an axis-cylinder. Ac- 

 cording to Golgi there are 

 everywhere in the cortex cells 

 with branched and those with 

 unbranchcd axis-cylinders. The 

 majority of the processes are 

 directed inward toward the 

 white substance of the hemi- 

 spheres. The deeper we 

 into the cortex, the larger 

 the pyramidal cells become and 

 the longer are their apex 

 processes. TVe can divide the 

 cortex into several layers, ac- 

 cording to the size of the cells. 

 Under the glia layer (marked ( 

 T) comes the layer of small 



cells (2). This passes imper-^f^V 



o~ 



go 



FIG. 37. Section through the cortex of a frontal convolution. On the right the cut is 

 taken from a spr.-imen stained hv Weigerfs haematoxylin method ; on the left, from specimens 

 treated, according to Holgi, with sublimate. On the right only the fibres, on the left only the 

 cells are to be seen. The latter were present in greater abundance than as shown in the cut. 

 Inasmuch as tin- spares around the cells are filled in when Golgi's method is used, the latter 

 appear larger than they really are. 



Gennnn^' In r Xtn-i/. Line of Gennnri. 

 Interraiiiiires Flecfiticerk, luter-radial net-work. 



Superrarfiiires FlcrJttirerl; Super-radial net-work. 

 Tangentialfasern, Tangeutial fibres. 



