252 ALBERT KUNTZ 



oculoinotor nerve, l)ut receives also a relatively small number of 

 cells which wander out from the Gasserian ganglion along the path 

 of the ophthalmic nerve. 



My own o])servations on the development of the ciliary gan- 

 glion in the chick substantiate those of Carpenter in all essential 

 details. Furthermore, this ganglion sustains the same genetic 

 relationships to the oculomotor and the ophthalmic nerves in the 

 chick as it does in the turtle and the pig and arises in essentially 

 the same manner in embryos of these three types of vertebrates. 

 Detailed observations on the development of the ciliary ganglion 

 in embryos of the pig are recorded in an earlier paper. Observa- 

 tions on the development of this ganglion in embryos of the turtle 

 are recorded in an earlier section of the present paper. Detailed 

 observations on the development of this ganglion in embryos 

 of the chick will, therefore, not be presented in this paper. 



Otic ganglion 



In embryos of the chick in which the sympathetic trunks are 

 becoming well differentiated, a fibrous process may be traced 

 cephalad from the superior cervical ganglion along the median 

 aspect of the carotid artery until it merges into the sympathetic 

 plexus surrounding this artery. At the level of the geniculate 

 ganglion fibers again emerge from this plexus. Some of these fibers 

 mingle with the fibers of the great superficial petrosal nerve ; the 

 majority of them, however, continue cephalad, forming a more or 

 less definite fiber-tract. A relatively small number of fibers from 

 the great superficial petrosal nerve also enters this tract. A few 

 cells with nuclei of somewhat larger size than the nuclei of the 

 surrounding cells may be observed in the sympathetic plexus sur- 

 rounding the carotid artery. These cells are, doubtless, sympa- 

 thetic elements which have advanced cephalad from the superior 

 cervical ganglion. Similar cells are present in the fiber-tract which 

 continues cephalad from the plexus surrounding the carotid artery. 

 Some of these cells, doubtless, advance peripherally from the 

 geniculate ganglion along the fibers which deviate from the course 



