384 THE INTERMEDIATE PRIMATES 



duct. In its lateral portion are several dense bundles of myelinized axons 

 representing the descending fibers of the trochlear nerve (N4) as they 

 pass downward to the level of their linal decussation before emergence from 



FIG. 100. MACACUS. LEVEL OI UlL IMLKIOK COLLICULUS. 



CEN, Central Gray Matter; ctt. Central Tegmental Tract; ic, Inferior Colliculus; lf, Lateral Fillet; mf. 

 Mesial Fillet; N4, Trochlear Nerve; pd, Predorsal Bundle; pl. Posterior Longitudinal Fasciculus; pn, Pontile 

 Nuclei; pns. Pons; pv, Pyramid; ref. Reticular Formation; rst. Rubrospinal Tract;scp, Superior Cerebellar 

 Peduncle; spt. Spinothalamic Tract; xscp, Crossing of the Superior Cerebellar Peduncle. [Accession No. 149. 

 Section 320. Actual Size 16 X 14 mm.] 



