254 ALBERT KUNTZ 



evidence that any considerable number of cells advancing periph- 

 erally along the fibers of this nerve enter the anlage of the sphe- 

 nopalatine ganglion. The fibers of the great superficial petrosal 

 nerve, on the other hand, are accompanied by numerous cells of 

 nervous origin, many of which obviously enter this ganglion. 



In view of the above observations, the sphenopalatine ganglion 

 arises, in embryos of the chick, primarily from cells which ad- 

 vance peripherally from the geniculate ganglion along the great 

 superficial petrosal nerve, but probably receives cells also which 

 advance peripherally from the Gasserian ganglion along the max- 

 illary nerve. In view of its genetic relationships to the great 

 superficial petrosal and the maxillary nerves, this ganglion is 

 homologous with the sphenopalatine ganglion in the turtle, but 

 is not entirely homologous with the sphenopalatine ganglion in 

 the pig. 



Submaxillary ganglion 



The submaxillary ganglion is only relatively feebly developed 

 in the chick. It arises in the submaxillary region in the path of a 

 slender branch of the mandibular division of the trigeminal nerve. 

 (fig. 19, subrng). Neither sympathetic root nor fibrous connection 

 of the submaxillary ganglion with the facial nerve could be ob- 

 served during the early stages of development. The submaxillary 

 ganglion is, therefore, genetically related primarily to the mandib- 

 ular nerve and probably arises exclusively from cells which 

 advance peripherally along the fibers of this nerve. 



THE PIG 



Summary 



According to the writer's observations set forth in the earlier 

 paper referred to above, the ciliary, the sphenopalatine, the otic, 

 and the submaxillary ganglia arise, in embryos of the pig, pri- 

 marily from cells which have their origin in the Gasserian ganglion 

 and the walls of the mesencephalon and rhombencephalon and 

 advance peripherally along the oculomotor nerve and the several 



