436 THE INTERMEDIATE PRIMATES 



LE\ EL THKOUGH THE MIDDLE OF THE PONS X'AROLH (FIG. 2o6) 



At this level all three layers ol this structure may be discerned, namely, 

 the stratum superticiale pontis, the stratuni complexum pontis, containing 



FIG. 205. GIBBON. LE\EL Ol I III I MERGENCE OF THE SIXTH CRANIAL NERVE. 

 MCP, Middle Cerebellar Peduncle; mf, Mesial Fillet; nab, Abducens Nucleus; nbe, Nucleus of Bechterew; 

 NDT, Cerebellar Nuclei, Lateral Group; nfg. Cerebellar Nuclei, Mesial Group; nr. Nucleus of Rolando; n6, 

 Abducens Nerve; N7, Facial Nerve; n8. Auditory Nerve; i>v. Pyramid; so, Superior Olive; tkd. Descending 

 Trigeminal Tract. [Accession No. 141. Section 172. Actual Size 20 X 16 mm.| 



some scattered fasciculi ol the pyramid ( Py ), the pontile nuclear mass 

 ( PN ) and some decussating pontile libers, and the stratum |)rolundum pontis 

 largely made up of transverse decussating libers. At the lateral extremity 

 of the section are the collected bundles constituting the middle cerebellar 

 peduncle ( Mcp ). Entering the brain stem at this \v\c\ near the mesial sur- 

 face arc some dorsal root axons of the fifth nerve ( N5 ) on their way to the 



