RECONSTRUCTION OF SIM I A SAT^ RUS 



539 



The Pontile Nuclei 



This nuclear mass is very nuicli more eomplieatecl tlian in any of the 

 lower primates. Although much more mtneate, the arranuenu'nt is identical 



l-IG. 243. LATERAL SURFACE OF GRAY MATTER OF BRAIN STEM, SIMIA SATYRUS. 

 Key to Diagram, dors, cochl.. Dorsal Cochlear Nucleus; gen. body, Geniculate Body; inf. coll.. Inferior 

 Colliculus; INTERPED. GRAY MAT., Interpeduncular Gray Matter; nucl. of burdach. Nucleus of Burdach; 

 NUCL. OF D. and nucl. of drs., Nucleus of Deitors; nucl. 01 goll, Nucleus of Goll; pontile. Pontile Nuclei; 

 RET. FORM., Reticular Formation; subst. gel. of kolan. and si ust. gel. 01 koiando. Substantia Gclatinosa 

 of Rolando; vent, cochl., Ventral Cochlear Nucleus. 



with that loiind m lower lorms. The |)resenee ol the superhcial hiyer corre- 

 sponds to the general conhguralion and curves of the hram stem. The deep 

 la\er is in contiguity with tlu' superhcial surlace ol the reticidar lormation 

 as well as with the two buttresses which serve to connect the superhcial and 

 llu' del]) layers of the nuclear substance at tliiir extremities. The arciform 

 nuclei are relatively well dehned, beginning at aijout the mid-olivary region 

 as strips of gray matter disposed along the mesial and ventral surfaces of 

 the pyramid. 1 iiese strips continue upward, gradually increasing until a 



