RECONSTRUCTION 01- SIMIA SAT^ RUS 



53: 



as the structLirc is followed u]3\\arcl into tlu' stiTii the luiclcar mass uncicTgocs 

 a partial rotation until its dorsal surface isdireettd towards the lateral periph- 

 ery of the oblongata. The eonstrietion whieh was found to he almost con- 



FIG. 241. VENTRAL SL HP ACE OF GRAY MATTER OF BRAIN STE.M, SIMIA SATVRLS. 



Key to Diagram, inf. olive. Inferior Olive; i-Ar. f;t;N. body, L.iteral Geniculate Body; meso-g. body. 

 Mesial Geniculate Body; pontile, Pontile Nuclei; ret. form., Reticular Formation; v. CH. and vent. 

 COCHL., Ventral Cochlear Nucleus; v. or. col. and ventral gray col., Ventral Gray Column. 



stant in the conformation of this nuclear mass is not so well delined in Simia 

 satyrus as in the other s[)ecies. It is faintly indicated at tlu' mid-ventncular 

 le\el of the stem. The substantia gelatinosa trigemini continues upon the 

 surface of the reconstruction to a point \\hich corresponds ap])r().\imately to 

 the closure of the pontile Ncntrieular ca\Tty. Here it expands to lorm the 

 caput of the nucleus and at this point comes into relation with the motor 

 nucleus of the trigeminal ner\e. 



The Inferior Oli\ arv Nucleus 



Tlu' inlt'iior (>li\ar\ nucleus in the orang-outang assumes considerable 

 complexitx and bulk. The fundus of the nucleus is broad and disposed toward 



