THE STRUCTURE OF THE BRAIN STEM 



439 



Optic 



Internal | 

 Cifjsulej 



Lenficular) ' 

 Nucleus J 



Substarrlia Nidra. 



Rubro-Spinil Tract 



_- Red Nucleus 



Pyramidal Tract 



ClauslYum 



Dentate Nucleus 



Nucleus 



ive 



Vesfibulo Spinal Tract 



Crossed Pyramidal Tract 



Direct Pyramidal Tract 



D65C6MDIN& M6RVE 

 TRACTS. 



FIG. 200. Schema of course taken by chief descending tracts of brain stem. ( GORDON 

 HOLMES.) The tract in red, to the right of the rubro -spinal tract, includes the 

 posterior longitudinal bundle, together with the fibres of the thalamo-spinal and 

 tecto-spinal tracts. 



