380 DISSECTION OF THE RABBIT. 



b. The olfactory lobes are a pair of large club-shaped 



bodies, projecting forwards from beneath the 

 anterior ends of the hemispheres. 



c. The thalamencephalon is covered by the hemi- 



spheres, and cannot be seen from the dorsal 

 surface. 



d. The corpora quadrigemina, or optic lobes, are two 



pairs of rounded elevations on the dorsal surface 

 of the brain, and almost completely covered by 

 the hemispheres. 



M 



MB "^ SI 



CP 



H 



Fis. 65. — lepuB cuniculus. The brain dissected from the right side. 



X 2. (c. H. H.) 



G, cerebellum. CO, corpus caUosum. CP, choroid plexus. CS, corpus 

 striatum. HA, frontal lobe of right hemisphere. HL, left hemisphere. H, 

 hippocampus major. M. medulla oblongata. O, olfactory lobe. OP, anterior 

 optic lobe. P, pineal body. PV, pons Varolii. 



IT, 1 cot of optic nerve. V, root of trigeminal nerve. VI, root of abducent 

 nerve. VIII, root of auditory nerve ; immediately in front of it is seen the 

 root of the facial nerve. SlI, spinal accessory nerve. 



e. The cerebellum is a large transversely elongated 



mass, lying behind the hemispheres. It is divided 

 into a large median lobe, the vermis, and two 

 lateral lobes, to the outer sides of which are the 

 small rounded floocular lobes. 



The whole surface of the cerebellum is marked 

 by close-set folds, mainly transverse in direction. 



f, The medulla oblongata is the part of the brain 



