RECONSTRUCTION 01- SIMIA SAT^'RUS 541 



l)\ tlif dorsal tDclikai- nuclcLis, together with the striae acusticae which 

 cross It to enter {\iv lateral reeess ol the lourtli \entriele. Tlie nucleus of 

 Bechterew js eontinuecl dorsallx Irom the vestibular complex into the 

 lateral wall ol tlu' loiirth \fntriele and is well show 11 in the reconstruction. 



The Cochlear Complex 



The cochlear complex is relali\ely nisi<inilieant. The ventral cochlear 

 nucleus is so disposed as to prest'ut a trough which recenes the entering 

 fibers oi" the cochlear nerxe, which thus is surrounded on its ventral, hiteral 

 and dorsal aspects. Tlu' mesial aspect of the ner\e is in contact with the 

 rcstitorm hod\ and the tegmentum ol the metenccphalon. 



The dorsal cochlear nucleus is also relati\ c'l\ inconspicuous. It is connected 

 with the ventral cochlear nucleus by strands of gray matter and also by the 

 libers which make up the enteruig cochlear root. 



The CoLLici LI 



The inU'rior eoHieukis appears asa condensation in tht'dorsal mesencepha- 

 lic reticular formation and is of somew hat greater size than is found in tludowcr 

 forms. This increase in size, however, is dt'peiulent only uj)on the general 

 increase in bulk. The eollieulus seems to be ol relatively less extent and sig- 

 nilieanet' in this form than it is in thosi' already described. It is supported 

 laterally b\ tlu' lateral extension of the mesencephalic reticular formation, 

 whereas dorsally it rests on the undilferentiated median gray matter. It is 

 separated from the sujieiior eollieulus by a lateral extension irom tlu' retic- 

 ular formation which passes dorsomesially in tlu' intercollicular sulcus. 



The superior eollieulus is of moderate size, resting latei"all\ upon the 

 reticular formation and dorsall\ ujion tlu' dorsal median undillerentiated 

 gray matter. Its nuclian extremity is disposed similarly to that oi the inferior 

 eollieulus and is transversed b\ the formation in this region of the intercollic- 



