TROGLODYTES NIGER, THE GIIIMPANZEE 



177 



whose outrr margin arc liie collrttcd lilxrs lormin"; tlu' descend ill": triiicni- 

 inal tract f Trd ). 



The impnssion conNcyed In a critical siir\c'\ of this dorsal lield with 



FIG. 256. CHIMPANZEE. LEVEL Ol- rHL m KA.MIDAL DECUSSATION. 



en, Column of Burdacli; ctN, Central Gray Matter; (<;, Column ol'Goll; dt, Oeitersospinal Tract; im. 

 Dorsal Spinocerebellar Tract; Gow, Ventral Spinocerebellar Tract; iii;l, Spino-olivary Tract of Hehveg; ng. 

 Nucleus of Goll; nk, Nucleus of Rolando; py, Pyramid; I'vx, Pyramidal Decussation; kst. Rubrospinal 

 Tract; spt, Spinothalamic Tract; trd, Descending Trigeminal Tract; ven. Ventral Gray Column; xi>v. 

 Crossed Pyramidal Tract. [Accessicm No. i 5-. Section 50. Actu;il Size 12X0 mm.) 



rclerciice to the discriininatiNC capacity oi the aiiiinal is that oi a seii.sory 

 organization in which the lorelimb and hand contribute a greater \olunu' of 

 afTcrent inlhix than either the head or the lower e\treniit\ . This in the main 



