330 



THE INTERMEDIATE PRIMATES 



conditions indicate that vision in the baboon is as yet only partially binocular 

 and the convohitions in the occipital lobe bear out the presumption advanced 

 on the strength of the intcrocular connections between the oculomotor 



FIG. 154. BABOON. LEVEL OF THE SUPERIOR COLLICULUS. 

 CEN, Central Gray Matter; ctt, Central Tegmenta] Tract; cp, Cerebral Peduncle; mf, Mesial Fillet; mgb. 

 Mesial Geniculate Body; noc. Oculomotor Nucleus; nru, Nucleus Ruber; N3, Oculomotor Nerve; pd. 

 Predorsal Bundle; PL, Posterior Longitudinal Fasciculus; ref. Reticular Formation; sbn. Substantia Nigral 

 sc, Superior Colliculus; spt, Spinothalamic Tract. [Accession No. 150. Section 341. Actual Size 19 X 12 rnm.; 



nuclei. The fibers of the oculomotor nerve (N3) sweep forward and out- 

 \\ard from the nucleus in their course to emerge from the brain stem in 

 the sulcus oculomotorius. Ventrolateral to the central grav matter (Cen) 



