RECONSTRUCTION OF LEMUR MONGOZ 



77 



ventral gray column. It allords attachment to the nuclei of GoII and Burdach 

 dorsally and to the substantia gelatinosa trigemini laterally, which, however, 

 becomes separated from the reticular formation at a higher level by the 



FIG. 37. DORSAL SURFACE OF GRAY MATTER OF BRAIN STEM, 

 LEMUR MONGOZ. 



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

 Lateral Geniculate Body; meso-gen.. Mesial Geniculate Body; nucl. of burdach. Nucleus of Burdach; 

 NUCL. OF deiter, NucIcus of Deiters; nucl. of goll, Nucleus of GoII; ret. form., Reticular Formation; 

 SUBST. gelat.. Substantia Gelatinosa; subst. gel. rolando. Substantia Gelatinosa of Rolando; vent, 

 cochl.. Ventral Cochlear Nucleus. 



entering vestifiular and cochlear nerves and the lateral fillet. 



Arising from the dorsal and ventral cochlear nuclei of both the homo- 

 lateral and contralateral nuclear complexes, the fibers of the trapezoid body 

 develop as a boundary between the reticular formation and the deep layer 

 of the pontile nuclear masses. This body lies in a recess in the ventral surface 

 of the reticular formation. Passing laterally from the superior olive, the 

 trapezoid body forms the lateral fillet which then skirts the edge of the 

 reticular formation, piercing it in some areas as its fibers pass upward to end 



