CRANIAL SYMPATHETIC GANGLIA IN THE RAT 205 



SUMMARY 



1. Large numbers of cells of vagus origin reach the cardiac, 

 intestinal, gastric, tracheal, esophageal, and possibly pharyngeal 

 plexuses. 



2. Cells of glossopharyngeus origin give rise to certain small 

 ganglia of the pharyngeal wall, the posterior third of the tongue, 

 the tympanic plexus, and, in addition to these, to the otic ganglion. 



3. The sphenopalatine ganglion is a ganglion belonging de- 

 velopmentally to the ramus palatinus VII (great superficial 

 petrosal) . 



4. The sphenopalatine and otic ganglia are therefore developed 

 from cells migrating along those nerve trunks which, in the 

 adult, carry preganglionic fibers to the ganglia. 



5. Circumstantial evidence favors the interpretation that the 

 submaxillary and sublingual ganglia, together with certain small 

 ganglia of the anterior two-thirds of the tongue, are of facialis 

 origin, the path ofmigration being the chorda tympani. 



6. Neuroblasts giving rise to the ciliary ganglion reach the 

 orbit by way of the ramus ophthalmicus V. 



7. The ganglion cells of the nervus terminalis originate in a 

 proliferation of cells of the olfactory sac. 



8. Ganglion cells of the carotid plexus and its allied plexuses, 

 together with a portion of the cells of the tympanic plexus, 

 arise as extensions forward from the superior cervical sympa- 

 thetic ganglion. 



