,-02 



THE HIGHER ANTHROPOIDS 



LEVEL OI- THE F'l KAMIDAL DECUSSATION (FIG. 220)) 



At the level of tlu' pyramidal decussation the crossing iibers of the 

 corticospinal tract make their usual im]:)ressi\e alterations. In consequence 



FIG. 22g. OKANG-OUTANG. LE\EL OF THE PYKANnOAL DECUSSATION. 



en, Coliinm ol Biirdach; cen, C-entr.il Gray M.ittir; cc, (Column of Coll; m, Dcilcrso-spinal Tract; Fi.r. 

 Dorsal Spinocerebellar Tract; oow. Ventral Spinocerebellar Tract; hel, Spino-oiivary Tract of Helweg; 

 NR, Nucleus of Rolando; i>v, Pyramid; i>vx. Pyramidal Decussation; Rsr, Rubrospinal Tract; spt. Spino- 

 thalamic Tract; trd, Descending Trigeminal Tract; ven, Ventral Gray Column; xpv. Crossed Pyramidal 

 Tract. [Accession No. 199. Section jj. Actual Size 12X11 iiim.| 



