188 



FRED W. STEWART 



Shortly afterward the intermingling of fibers from other nerves 

 so complicates the region that nothing may be ascertained. The 

 ramus pharyngeus vagi is considerably smaller at this stage than 

 the corresponding glossopharyngeal branch. The latter will be 

 considered in a subsequent connection. 



In briefly concluding the section on the vagus, the statement 

 may be reiterated that, far from finding that the vagus plays 



Ph. §§| 



Fig. 9 Rat embryo, 15 days, Carnoy's 6-3-1. Elongate cells massed along 

 fibers of the ramus lingualis IX as it enters the tongue. Projection drawing, 

 X500. 



no part in the development of sympathetic nerve cells, the 

 author's results seem to indicate that part if not all of the nerve 

 cells found in the cardiac, gastric, tracheal, esophageal, pulmo- 

 nary, and upper intestinal plexuses are of vagus origin. 



Glossopharyngeal portion of the sympathetic 



An examination of the glossopharyngeal nerve for developing 

 sympathcl \^■ neuroblasts must include the study of three branches, 

 namely, the lingual branch, the pharyngeal branch, and the 



