RECONSTRUCTION OF HUMAN 



843 



oftlK' upper and niKkllc tliircis ol tlu' ()ii\arv complex, sli<z;litl\ caudal to the 

 first appearance of the pontile nuclei and the termination ol the arcilorni 

 nucleus. The dorsal accessorx olive seems de(initel\- to <;i\e rise to the mam 



FIG. 360. DORSAL SURFACE OF GRAY MATTER OF BRAIN STEM, HOMO SAPIENS. 



Key to Diagram, gen. gray M.vriER, Ontral Gray Matter; LAr. gemc. body. Lateral Gcnieulate B<jd\ ; 

 MESIAL GENic. BODY, Mesial Geniculate Body; Nuc. clav., Nucleus Clava; nuc. gun.. Nucleus Cuneatus; 

 PONT NUC., Pontile Nucleus; ret. roRvi., Reticular Formation; zona inc.. Zona Incerta. 



mass of the ol!\"arv nucleus, this sac-like structure apparently di'xeloping 

 from the lateral extremity or \entral surlaceol the dorsal accessory nucleus. 

 The main mass of the inferior olixary nucleus lorms a plicated sac, the 

 nKjuth of which is directed dorsomesially, while the fundus, w hich is directed 

 ventrolatcrallx , presents numerous coinolutions producmo; tlu' eminence on 

 the surface of the stem, called the olivary eminence. Dorsomesially, the 

 dorsal lamina of the oli\ar\ nucleus and the dorsal accessory nucleus luse 

 and rest upon the \cntral surface of the reticular formation w hich is hollowed 

 out to receive this ma.ss of gray material. Tht' inferior oli\ary nucleus proper 



