FIG. 267. CHIMPANZEE. LEVEL OF THE INFERIOR COLLICULLS. 

 CEN, Central Gray Matter; ctt. Central Tegmental Tract; \c. Inferior (^ollicukis; u-. Lateral Fillet; mf, 

 Mesial Fillet; ntr. Nucleus Trochlcaris; pd, Predorsal Bundle; pi., Posterior Longitudinal Fasciculus; p.n. 

 Pontile Nuclei; pns, Pons; pv, Pyramid; ref. Reticular Formation; hst, Rubrospinal Tract; spt. Spino- 

 thalamic Tract; spx, Crossing of the Superior Cerebellar Peduncle; tmt, Ascending Mesencephalic Tract ot 

 the Fifth Nerve. [Accession No. 157. Section lyg. Actual Size kj X >') mm.) 



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