RECOXSTRl CTIO\ 01- TROGIOD^TES NIGER 



(ns 



The vi'iitral surlact' ol ihr reticular lorniation enters Into intimate rela- 

 tionsliip w ith the dorsal extremity ot the lateral and mesial buttresses wliieli 

 lorm the mam mass ol tlu' pontile nuclei. Between these two areas of con- 



I-IG. 274. LATERAL SURFACE OF GRAY MATTER OF BRAIN STEM, 

 TROGLOD^ TES NIGER. 

 Key to Diagram, dorsal cochl., Dorsal (^ochk'ar Nucleus; IM-. coll., Inferior Colliculus; inf. olive, 

 Inferior Olive; lat. gi-.n'. body, Lateral Geniculate Body; meso-gen. body. Mesial Geniculate Body; nucl. of 

 bukdach. Nucleus of Burdaclt; n. or D. and nucl. of deiters. Nucleus of Deiters; nccl. of goi.l, Nucleus o( 

 Goll; RET. FORM., Reticular Formation; subs. <;fi . rol. and subst.gel. kolando. Substantia Gelatinosa oi 

 Rolando; sibsi. nigra, Subst.intia Nigra; sir. coll., Superior (Colliculus; viniral cochlear, \'entr.il 

 Cochlear Nucleus. 



tact tlie dorsal surface of the cK'cp layer of the pontile nucleus does not fuse 

 with the xx'iitral surface of the reticular lorniation, since m tins area the 

 trajiczoid bod\ and the other peripheral condensation ol (ihcrs develop. 



As the mesencephalon is approached the reticular lorniation replaces 

 the substantia jiclatinosa tri^H'iuini and the uppt'r jjart of the vestibular 

 complex as these structures dimmish and linally disappear. In this region 

 the formation extends backward until it comes into contact witii the central 

 gray matter. Its lateral |)ortion is tunnelled Irom Ix'hmd lorward and from 

 without inward by tlu' superior cerebellar |3eduncle as this mass oi libers 



