TROGLOD^TES GORILLA 



66 1 



clearly than the external appearance of the brain stem the definition of the 

 sulci which form the boundary lines of the various functional territories in 

 the axis. The ventral paramedian sulcus indicates the lower hmit of the pre- 



FIG. 299. GORILLA. LEVEL OF CAL DAL EXIKEMITV OF INFERIOR OLI\"E. 



CB, Column of Burdach; cen, Central Gray Matter; CG, Column of Goll; nr, Deiterso-spinal Tr.ict; F.\i, 

 Internal Arcuate Fibers; fle, Dorsal Spinocerebellar Tr.ict; Gow, Ventral Spinocerebellar Tract; H, Spino- 

 olivary Tract of Hehveg; 10. Inferior Olive; nh. Nucleus of Burdach; nbl. Nucleus of Blumenau; ng. Nucleus 

 of Goll; NR, Nucleus of Rolando; I'v, Pyramid; pyx, Pyramidal Decussation; kef. Reticular Formation; rst. 

 Rubrospinal Tract; spt. Spinothalamic Tract; tko, Dcscendini^ Trii;eminal Tract. [Accession No. J. D. 

 Section ig^. Actual Size i; X n mm.| 



