168 



LECTURES ON THE CENTRAL NERVOUS SYSTEM. 



size ('2, Fig 1 . 102) pass into the spinal cord, which do not run 

 directly toward the median line, but pass in a curve through the 

 white substance laterally toward the columns of Clarke, where 

 they are lost sight of. A few fibres run directly through the 

 posterior horn ven trad of the substautia gelatinosa, and then 



FIG. 102. 



Diagram of a transverse section of the spinal cord, showing the central course of some 

 of the most important tracts. Compare Fig. 98, whit his not diagrammatic. 



Grenzsrhirftf. Limiting layer. GrnniJ Biittttrl. Gromid bundle. 



Klfinhirn-Seitentttrang-Bahn, Lateral cerobellar tract. /'//iv/iiV. Vonl-St. B.. Anterior pyramidal tract. 



PyramiJen-Seiteiuttr. B., Lateral pyramidal tract. &-iti-n>str.. Lateral column. 



Yortlerxtr., Anterior column. 



continue their course into the limiting lavcr of the lateral 



O 



column. They are shown with peculiar distinctness in Fig. 98. 

 The two last-described portions of the posterior roots lie on 

 the median side of the apex of the posterior horn. Laterally 

 from these lie the bundles which are distributed to the latter ; 

 we can distinguish both coarse and fine fibres. Neither of them 

 terminate at the level of their entrance into the cord. The larger 



