176 



STUDY OF PIG EMBRYOS. 



following order: N. 5, the trigeminal ganglion; N. 7, 8, the aeustico-facial gan- 

 glion complex; Ot, the otoeyst, an oval vesicle with very distinct epithelial walls. 



com. II. 



X.10. 



D.E. -fr? 



n /r. 



A 



Fig. 113. — I'ig, 12.0 mm. Transverse Series 5, Section 185. 



com, Ganglionic commissure between hypoglossal and vagus nerves. mm. II, Ganglionic commissure with 

 fibers of the root of the spinal accessory nerve. D.E, Ductus endolvmphalicus. F.i, Fore-brain. Mi, 

 Medulla oblongata. /V.j, Trigeminal ganglion. .\'.y.S, Aeustico-facial ganglion. .Y./,\ Jugular 

 ganglion of the vagus. Of, Otoeyst. Vtn.IV, Fourth ventricle. X 22 diams. 



Xuxt the ninth or glosso-pharyngeal nerve (scarcely appearing in the section on 

 the right side of the embryo) is shown by the upper portion of its ganglion on the 



