58 Bulletin of Laboratories of Denison University [Voi. xiii 



The substantia reticularis is clearly the chief medium of 

 communication between the sensory and motor centers for sim- 

 ple reflex paths here, as in higher vertebrates. This reticular 

 substance receives gustatory fibers both from the secondary 

 gustatory tracts and from the intrinsic neurones of the vagal 

 lobe. We shall see beyond that it also receives fibers from the 

 facial lobe. 



lobus facial I 



com.rW/.nl 



Fig. 75. Section through the right lobus glossopharyngei of a young carp 



8 cm. long. Golgi method. X 40- 



The section is approximately transverse, but very oblique, so that the right 

 side and the ventral surface are much farther cephalad. It cuts the lobus IX at 

 its widest part and shows a strand of the communis root of the facialis (a) arch- 

 ing over its dorsal side and apparently entering both this lobe and the cephalic 

 part of the lobus vagi. Terminal arborizations of the communis root of the vagus 

 are also shown ending in the layer of secondary neurones of the lobus vagi. 



com.r. VII, communis (gustatory) root of the facialis; n. IX. mot., motor nu- 

 cleus of the IX nerve ; r.IX.mot., motor root of the IX nerve ; r.IX.s., sensory 

 root of the IX nerve ; r.X.s., superficial gustatory vagus root ; s.g.t., secondary 

 gustatory tract ; sp. V, spinal V tract ; V, ventricle. 



