5i6 THE HIGHER ANTHROPOIDS 



dorsal cochlear nucleus, and others, either as secondary relay fibers or as 

 fibers primarily recei\'ed from [hv cochlear di\ision itself", pass uiward and 

 forward along the \entral portion of the tegmentuni to form the massive 



FIG. 234. ORANG-OUTANG. LEVEL OF THE CEREBELL.\R NUCLEI. 



CEEJL, Cerebellum; mci', Middle C'erebellar Peduncle; mf. Mesial Fillet; ndt, Cerebellar Nuclei, Lateral 

 Group; NFG, Cerebellar Nuclei, Mesial Group; n8, Auditory Nerve; pn. Pontile Nuclei; i>v. Pyramid; REF, 

 Reticular Formation; sci>, Superior Cerebellar Peduncle; so, Superior Olive; \ i;n i\ , Founli \ intricle; ver. 

 Vermis (x-rebelli. (Accession No. 199. Section 365. Actual Size 45 X 25 nini.| 



decussation of the corpus t rape/oidi'um. At the lateral e\tremit\ ot the 

 corpus trapczoideum is an aggregation of gra\ matter, the caudal extremity 

 ol the superior oli\ary nucleus i SO). This nucleus, like tlie trapezoid bod\', 

 is related to the conduction ol auditorx impulsi's receixed by the coch- 

 lear division of the t'ighth nei\e. \ entrolateial to the entering libiTs ol the 

 cochlear division of tlie eighth nerxc is tlu' substantia gclatlnosa Rolaiidi 

 surrounded u|)on its lateral as|:)fet by the desciMulmg trigeminal tract. 

 Directly ventral to the sui)stantia gi'latmosa is a w ell-dclmed nuclear 



