THE CEREBRAL CORTEX 



75 



thickest meshes are about the bodies of the largest pyramid cells and of the fusiform 

 cells of the deep layer. Many fibres ascend to the superficial layer, where a larger mesh 

 is shown to exist about the Cajal cells. There are terminal ends of fibres at all parts of 

 the cortex, and as Andriezen has pointed out these are non-medullated at their tips, where 

 they can come into contact with the dendrites and apical processes of the cortical cells. An 

 attempt has been made by Cajal l to trace the probable course of impulses through the 

 various cortical layers, but such an attempt is too hypothetical to be at present considered. 



1 Cajal, Les nouvelles Idees sur la structure du Systfeme Nerveux, p. 66. Paris, 1894. 



