SIMIA SATYRUS, THE ORANG-OUTANG 



;oi 



cklloixsceiHT 111 tlu'Sf two specializations of the ciuadrigcminai plate in the 

 orang iiulieates w hat is e\ en niort' e\ iclent in cross section, i.e., a certain degree 

 ol inxolution incident to a delegation ot the tunctions oi" hearing and vision 



FIG. 228. DORSAL SLKKACE OF BRAIN STEM, ORANG-OLTANG. 



[Actual Length 54 nini.l 

 Key to Diagram, d. med. septi m, DorsDniidirin Septum; inf. coll.. Inferior Colliculus; sup. cerebl. ped., 

 Superior Cerebellar Peduncle; slp. collicllls, Superior Colliculus; tub. tricem., Tuberculum Trigemini; 

 8th nkv. Eighth Nerve. 



to specialized areas in the ct'rebral hemisphere. L poii the lateral surlacc of 

 tlu' 111 id!) ram, a small eli'\ at ion mdicatt'S the position ol the mesial geniculate 

 body, a relav station in the path\\a\ ol aiiditor\ sensibility. 



Intfrxai, Stricti re 01 nil Rk ain Stem in the Orang-Oltang 



The IcNC'ls selected in the orang-outang correspond closelx to those of 

 tlu' specirs already described. An\ dilK'rences in the appearance ol the 

 se\c-ral k'\els is met b\ the addition of su|)|)lementarv sections including 

 features which ma\ not ha\e ap|)eared in the representatiN'e le\els selected 

 lor di'sc-ription. 



