RECONSTRUCTION OF MYCETES SENICULUS 235 



appear leaving the loop of the chief nucleus to continue upward for a short 

 distance, after which it also comes to an end. The location of the inferior 

 olivary nucleus corresponds to that already described in lemur and marmoset. 



FIG. 129. VENTRAL SURFACE OF THE GRAY MATTER OF THE BRAIN STEM, 



MYCETES SENICULUS. 

 Key to Diagram, inf. olive, Inferior Olive; lat. gen. body. Lateral Geniculate Body; meso-gen. body. 

 Mesial Geniculate Body; pontile. Pontile Nuclei; ret. form.. Reticular Formation; subst. gel. rolando, 

 Substantia Gelatinosa of Rolando; subst. nigra.. Substantia Nigra; vent. coch. and vent, cochl.. Ventral 

 Cochlear Nucleus; vent, gray col., Ventral Gray Column. 



The base of the nucleus approaches the ventrolateral angle of the brain stem, 

 producing a slight elevation on the surface which corresponds to the olivary 

 body found on the surface of the brain stem. 



The Reticular Formation 



The reconstruction of this mass of gray and white matter appears as a 

 discrete body at about the middle of the pyramidal decussation. It is sepa- 

 rated from and lateral to the ventral gray column. It rapidly increases in size 



