131 



they car</e upon themselves to follow the course of that chan- 

 nel, forming the meiianbiindel of ^dinger ('3-3); see Pi*?.?!, 

 •n.s.t. The melian bundles, right and left, are thus carried 

 posteriorly and centrally beside the recessus neuroporicus 

 to/farJ the base of tne brain. Here each blends '^ith the part 

 of the traotus strio-thalamicus taking origin from the stria- 

 tum of that side, for'ning its central portion. 



The coarse taken by the median bundle, curving forward as 

 it does to lie beside the vestige of the neurDpore, is certain- 

 ly fraught witn significance. This is probably an ancient 

 route which was at one time quite direct, but the phylogenet- 

 ic enlargement of the forebrain has carried the recessus neu- 

 roporicus and the seat of the neurones ever farther and farther 

 apart. 



The neurones of the nucleus neuroporicus probably function 

 as an olfacto-motor centre, supplementary to the chief one 

 represented by the general striatum. The relations of this 

 nucleus to the pallium will be discussed under the following 

 subsection. 



4. The Pallium. 

 The neurones of the pallium lie chiefly in what are called 

 in this paper the pallial emiienoes; see Big-l and t<'ig.31, p.e. 

 I have introduced the definitive term pallial eminence for the 

 hemispherical roof of the dorsal diverticulum of each lateral 



