176 



STUDY OF PIG EMBRYOS. 



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

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



com. II. 





Ven. IV. 



FIG. 113. PIG, 12.0 MM. TRANSVERSE SERIES 5, SECTION 185. 



com, Ganglionic commissure between hypoglossai and vagus nerves. com. I I, Ganglionic commissure with 

 fibers of the root of the spinal accessory nerve. D.E, Ductus endolymphaticus. /'., Fore-brftin, Md, 

 Medulla oblongata. jV.j, Trigeminal ganglion. N,j,8, Acustico-facial ganglion. X.io, Jugular 

 ganglion of the vagus. Ot, Otocyst. Ven. IV, Fourth ventricle. X 22 diams. 



Next the ninth or glosso-pharyngeal nerve (scarr e'jy appearing in the section on 

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



