28o 



Anatomy of the Rabbit. 



(e) The posterior funiculus, in passing forward from the cord r 

 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. 

 6. 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 : 



Fig. 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; cm., mam- 

 illary body; c.o., optic chiasma; c.p., pineal body; fix., cervical flexure; h., 

 habenular commissure; h.c, cerebral hemisphere; hp., hippocampus; inf., infundi- 

 bulum; l.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 peilucidum; t.c, tuber cinereum; th., thalamus, 

 massa intermedia; v.m.a., anterior medullary velum; v.m.p., posterior medullary 

 velum; v.q., fourth ventricle; v.t., third ventricle. I, olfactory nerve (origin); 

 II, optic nerve. 



(a) 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). 



(b) 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 



