RECONSTRUCTION OF HUMAN 



841 



rapidly dfcrrasi's in s\av and iinportancc, its [ilacc iu'iiig takt'ii 1)\ the appear- 

 ance of tin- mu'lear material appearing in eoniieetion w ith the \estil)ular eoni- 

 plex. In assoeiation with the u|)|)er half of the iiueleus th(.Te cle\el<)|)s upon 



FIG. 359. LATERAL SL Rl- ACE OF GRAY .\L\TTER OF BRAIN STEM, HOMO SAPIENS. 



Key to Uiac;ram. arc. nlc, Arcil'orm Nucleus; cen. gray. Central Gray Matter; inf. coll., Inferior 

 Colliculus; INI-. oi.iv.. Inferior Olivary Nucleus; lateral genic. Lateral Geniculate Body; mes. 

 Genic, iMesial Geniculate Body: nuc. clneatus, Nucleus Caincatus; RET. form., Reticular Formation; 

 SUB. GEL., SUBST. GEL. and IRIGEMINI, Substantia Gelatinosa Trigemini; sup. coll., Su])erior 

 Colliculus; VESTi. co\ii>le.\. Vestibular (Simplex. 



its latt'ral aspeet a mass of >j;ra\ matter, the nueU'us of Bliimeiiau, apparently 

 eonneeieci with the nueleus ol Buidaeh. 



The substantia tielatinosa Kolancli is eontinuecl upwarti into tlu' 

 oblongata as the reee|)ti\ f nuek'us lor the tri^enimal iu'r\c-, beni^ealletl m this 

 region the substantia gelatinosa tngemnu. I he nueleus is somewhat more 

 extensivi' both abo\e and below and presents a delinite eonstrietion m the 

 region of the entr\ of the eoehlear division of the eighth nerve. This has been 

 mentioned previously and may be ealli'd the waist of the trigeminal nueleus. 

 It maintains a relati\tl\ uiuhanged position in its course upward through the 



