MEDULLA OBLONGATA OF THE RABBIT, 



17 



nerve fibres. Moreover, it is much more deeply situated 

 within the medullary wall than in the younger embryo. 



Portions of the IX and X ganglia are seen in section, 



Fig. 13. 



Section of the medulla of an embryo rabbit 14 mm. at right angles to the 

 floor of the fourth ventricle in the region of the V ganglion. F, ganglion. TS^ 

 tractus solitarius. J., aorta. J", jugular vein. C, carotid. ifC, Meckel's carti- 

 lage. 



but one fails to follow nerve fibres arising from them as far 

 inward as the tractus solitarius. 



If we now make a section transverse to the floor of the 

 medulla, of an embryo of about the same age as in Figure 

 12, we shall find what is represented in Figure 13. 



