282 
(c) 
(d) 
ANATOMY OF THE RABBIT. 
The floor is formed by a greatly thickened mass of nervous 
matter, appearing from the interior of the ventricle in. the 
form of two convex ridges. One of these, posterior and 
medial in position, is the hippocampus. The other is 
smaller, anterior and lateral in position, and is the corpus 
striatum. Between the two bodies the pigmented vascular 
tissue of the chorioid plexus of the lateral ventricle may be 
made out. 
On the medial wall, the thickened posterior portion forms 
the body of the fornix, immediately in front of which is the 
thinner portion of the wall, described above as the septum 
pellucidum. 
8. The passage of the olfactory nerves to the ethmoturbinal 
surfaces may be traced by removing the nasal bones and working 
downward toward the cribriform plate, or the remaining portion 
of the skull containing the nasal region still intact may be divided 
vertically for a more extended examination of the nasal fossae. 
The features to be observed are largely those described in con- 
nection with the skeleton (pp. 138, 151). 
