The Island of Reil 



Xiipraradiary Layer. 



[CHAP. 



In the anterior insular area this layer has a scanty supply of fibres arranged more 

 or less transversely, short in length, and delicate. In the posterior area, also, the supply 

 is not good but there is just a sufficient aggregation of transversely-placed fibres at the 

 level of the junction of the upper and middle thirds of the layer to form a " line of 

 Kaes." In all parts of the insula " fibres of Martinotti " are rare. 



FIG. 23. Kadiary zone in the anterior insular region, x ifi. 

 Fibres of medium size are scarce and fibres of large calibre entirely wanting. 

 It so happened that in the section from which this drawing was taken the large chromophilous fusiform cells of 



the sixth layer retained the mordant and they have accordingly been included in the figure. 

 Illustrating the well-known difficulty of tracing the continuity between nerve cell and nerve fibre, I may mention 



that in many hundreds of sections of this kind giving a collateral display of cells and fibres I have not once 



succeeded in tracing that continuity. 



The Line of Baillarger. 



In the anterior region a line of Baillarger is barely recognisable, just a few fibres, 

 some short and some long, but all of delicate calibre, indicate its position. In the posterior 

 region, on the other hand, the line, is quite distinct, it contains a fair number of fibres, 

 some of medium size, and on the whole the condition we saw in the parieto-temporal cortex 

 is approached. 



