512 



THE RABBIT 



The diencephalon consists of a right and left optic thalamus 

 {fl. th.) between which is the slit-like third ventricle (v^) 



Ftc. 131. Two dissections of the Rabbit's brain, from above (nat. size). In A, the 

 left hemisphere is dissected down to the level of the corpus callosum ; on the 

 right side the lateral ventricle is exposed. In li, the hemispheres are dissected 

 down to a little below the level of the anterior end of the corpus callosum ; only 

 the frontal lobe of the left hemisphere is retained, of the right a portion of the 

 temporal lobe also is left ; the choroid plexus and pineal body are removed, as 

 well as the greater part of the body of the fornix and the whole of its left posterior 

 pillar ; the cerebellum is removed with the exception of a part of its right lateral 

 lobe with the flocculus. 



«. CO. anterior commissure ; a. Jo. anterior pillar of fornix ; a. pn. anterior peduncles 

 of cerebellum ; b./o. body of fornix ; cb^. central lobe of cerebellum ; cW-. its 

 lateral lobe; c.gn. elevation on the optic thalamus; ch. cerebral hemisphere; 

 ch.pi, part of choroid plexus ; cp. cl. corpus callosum ; cp. s. corpus striatum ; c. rs, 

 and d. p. elevations on the bulb ; /7. flocculus ; hp, iu. hippocampus ; ni.co. middle 

 commissure ; o. l^. o.-P-. optic lobes ; olf. olfactory lobe ; o. ih. optic thalamus ; o. 

 t?: optic tract (continuation of chiasma) ; /. co. posterior commissure ; p.Jb. 

 posterior pillar of fornix ; pn. pineal body ; pd.pn. its peduncle ; p.pn. posterior 

 peduncles of cerebellum; p.i'a. fibres of pons Varolii forming middle peduncles 

 of cerebellum ; sp. In. septum lucidum ; st. I. line on corpus callosum ; /, s. band 

 of white matter lying beneath choroid plexus ; v. vn. valve of Vieussens ; v^. 

 third ventricle ; tA. fourth ventricle. (From Parker's Zootomy.^ 



roofed over by a thin membrane, on the uppersurface of which 

 is a vascular choroid flexus (Fig. 132, vL ip\ and from the 



