200 



Ti/pe of Arrangement of Nerve Fibres 



[CHAP. 



Line of Baillarger. 



It is important to notice that this is one of the areas where the line of Baillarger 

 is reduplicated 1 , a point which did not escape the notice of Kaes; and, as that writer has 

 further indicated, the inner stria is not only equal to but in places thicker than the 

 outer one. The second line is situated in the radiary zone midway between the external 

 stria and the white substance, and, as will be mentioned in describing the cell lamination, 

 it corresponds in position with the internal layer of large pyramidal cells. As to composition, 

 each line contains numerous short, delicate, irregularly-placed fibrils ; among which are a few 

 fibres, longer, transversely-directed and medium-sized, and now and then a large fibre. 



The plainness of this doubling of Baillarger's line is not the least important distinguishing 

 feature of the " parietal " cortex. 



FIG. 20. Radiary zone in tbe parietal area. x i ^. 



The fibre wealth is less than' in the intermediate postcentral cortex (figure 5, page 69). Fibres of medium size are 



scarce, and fibres of large calibre almost entirely wanting. 



Radiations of Meynert. 



The fibres composing these fasciculi are mostly of fine and medium size, but occasionally 

 a fibre which must be included in the coarse medullated variety adds to the volume of 



1 A faint attempt at a reduplication of the line of Baillarger has been recognised in the cortex of the gyrus 

 fornicatus and in the temporal lobe. 



