C22 



THE HIGHER ANTHROPOIDS 



and the profundum. They aflord again an opportunity for estimating the 

 relative size of the pontile nuclei ( PN ). The trans^•erse libers of the pons are 

 collected to form the middle cerebellar peduncle (Mcp). The central 



FIG. 237. ORANG-OUTANG. LENEL OF EMERGENCE OF TROCHLEAR NERVE. 



CEN, Central Gray Matter; err, Central Tigtnental Tract; i.i , Lateral Fillet; mf. Mesial Fillet; N4, Trochlear 

 Nerve; pd, Predorsal Bundle; PL, Posterior Longitudinal Fasciculus; PN, Pontile Nuclei; pv. Pyramid; ri;f. 

 Reticular Formation; scp, Superior Cerebellar Peduncle; SCPX, Decussation of the Superior Cerebellar 

 Peduncle; sit, Spinothalamic Tract. (Accession No. i(>(). Section 560. Actual Size 19 X 16 mm.] 



gray matter, uliiie reduced in size, forms the floor of the \tntiicle whose 

 general dnnensions are now consicU'rablv h'ss than in thi' lower ie\ els, 



