MAMMALIA. 203 



FIG. XII. 



OBLONG MEDULLA. 



(HUMAN.) 



IT shows the oblique or most posterior layer of the annular tubercle extending 

 superiorly through the crus of the brain to the larger portion of the intermediate layer 

 of the exterior region ; it gives origin to the smaller portion of the fifth, the hard 

 portion of the seventh, and the ninth nerve. 



1. Pyramidal body cut short. 



2. Oblique layer of the annular tubercle passing through the crus of the brain. 



3. Quadrigeminal bodies. 



FIG. XIII. 



(THE SAME.) 



IT affords an opposite view of the same preparation. 



1. Median edge of the oblique or posterior layer of the annular tubercle. 



2. Involuntary centre placed between the posterior layer of the annular tubercle 



and the ventricular cord forming the floor of the fourth ventricle. 



D D 2 



