280 
ANATOMY OF THE RABBIT. 
(e) The posterior funiculus, in passing forward from the cord, 
6. 
is divided into medial and lateral portions. The medial 
portion, the fasciculus gracilis, forms a narrow band ter- 
minating forwards in a club-shaped expansion, the clava. 
The lateral portion, the fasciculus cuneatus, passes into 
the restiform body. 
The brain may be divided by a median vertical section, and 
one-half examined from the medial surface (Fig. 87). In addition 
to many of the features already made out on the surface the 
following may be noted: 
(a) 
(b) 

Fic. 87. The brain in median section: a., anterior commissure; a.c., cerebral 
aqueduct; b.o., olfactory bulb; cb., cerebellum; c.cl., corpus callosum; c.f., 
body of the fornix; cl.i., inferior colliculus; cl.s., superior colliculus; c.m., mam- 
illary body; c.o., optic chiasma; c.p., pineal body; fl.c., cervical flexure; h., 
habenular commissure; h.c., cerebral hemisphere; hp., hippocampus; inf., infundi- 
bulum; ].t., laminal terminalis; m.o., medulla oblongata; p., posterior commissure; 
p.c., Chorioid plexus of the third ventricle; pd.c., cerebral peduncle; pn., pons; 
sp., splenium; s.pl., septum pellucidum; t.c., tuber cinereum; th., thalamus, 
massa intermedia; v.m.a., anterior medullary velum; v.m.p., posterior medullary 
velum; y.q., fourth ventricle; v.t., third ventricle. I, olfactory nerve (origin) ; 
II, optic nerve. 
The deep but extremely narrow cavity formed by the third 
ventricle is the first space appearing in the brain from the 
anterior end, the first two (paired) ventricles lying laterally 
in the hemispheres. They are connected with the third 
ventricle by a narrow transverse canal, the interventricular 
foramen (foramen interventriculare). 
The anterior boundary of the third ventricle is formed ven- 
trally by the narrow partition separating the two hemi- 
spheres, in the dorsal portion of which is the small anterior 
