5 io 



MANUAL OF ZOOLOGY 



verse band of fibres connecting together the posterior 

 parts of the optic thalamu The latter (o. th) are large 



C.TS: 



Fig. 310. — Lepus CUniculUS. Two dissections of the brain from above (nat. size). 

 In A , the left parencephalon is dissected down to the level of the corpus callo- 

 sum; on the right the lateral ventricle is exposed. In B, the cerebral hemi- 

 spheres are dissected to a little below the level of the anterior genu 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 velum interpositum and pineal body 

 are removed, as well as the greater part of the body of the fornix, and the whole 

 of the left posterior pillar; the cerebellum is removed with the exception of a part 

 of its right lateral lobe; a, co, anterior commissure ; a.fo, anterior pillar of for- 

 nix; a. /•??, anterior peduncles of cerebellum; b.fo, body of fornix; cd 1 , superior 

 vermis of cerebellum; cb~, its lateral lobe; c. gn, corpus gen Sen la turn ; c, h t cere- 

 bral hemisphere", ck. pi, choroid plexus; cf>. cl, corpus callosum; cfi.s, corpus 

 striatum; c. rs, corpus restiforme; </./, dorsal pyramid; ft ', flocculus; hp. in, 

 hippocampus major; m. co, middle commissure; o. I 1 , anterior; 0. t-, posterior 

 lobes of corpora quadrigemina; o. th, optic thalamus; otr, optic tract; p. co, pos- 

 terior commissure", / Jo, posterior peduncles of cerebellum ; /, ya, fibres of pons 

 Varolii forming middle peduncles of cerebellum; sp. In, septum lucidum; st. I, 

 stria longitudinalis; t.s, tcenia semicircularis; v. vii, valve of Vieussens; v z , 

 third ventricle; z> 4 , fourth ventricle, (From Parker's Zootomy.) 



masses of mixed gray and white matter forming the lateral 

 portions of the diencephalon ; they are connected together 



