39 



The nucleus is a more or- less perfect oval, holding:' one or 

 more nucleoli. The chromatin is distributed in a few thin, 

 branching strands which give the appearance of joining in soine 

 parts of the nucleus. The chromatir never stains intensely in 

 these neurones, and so the nucleus is represented by light col- 

 oration in the figure. 



The cytoplasir lies principally in the broad areas where 

 the cell-body merges into the dendrites. Its tigroid substance 

 is never collected into large masses. In the region of the 

 nucleus, the tigroid material is chiefly in the condition of 

 medium-sized granules, with a few small triangles intercalated. 

 The dendrites have fusiform or linear tigroids scattered at 

 irregular intervals. A very small sxone-hill ock gives origin 

 to the axone. In the specimen figured, this lies at the side 

 of the most massive dendrite, but this location is not the rule 

 for these -neurones. 



b. Tefmination of Communis Fibres. — Ey far the greater 

 number of the coaimunis fibres from the VII, IX, and X nerves 

 pass directly to their termination in the lobus vagi, a few, 

 only, entering the fasciculus cooimunis, described below. 



Fibres penetrate the lobus vagi for ultimate termination 

 chiefly from the dorsal side ( Fig. ?, c. f . ) . They reacli this 

 position by a sweeping curve which carries them to an ever 

 higher level as they run inward from the exterior-. These in- 

 coming fibres constitute a thin stratum next the limitans inter- 



