5i6 



MANUAL OF ZOOLOGY 



verse band of fibres connecting together the posterior 

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



cxs. 



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 interpositnm 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./o, anterior pillar of for- 

 nix ; a. fin, anterior peduncles of cerebellum; b.fo, body of fornix; cb 1 , superior 

 vermis of cerebellum; cb 2 , its lateral lobe; c. g?i t corpus geniculatum; c. h, cere- 

 bral hemisphere; ch.pl, choroid plexus; cp. cl, corpus callosum; cp.s, corpus 

 striatum; c. rs, corpus restiforme; d.p, dorsal pyramid; fl, flocculus; hp in, 

 hippocampus major; ;«. co, middle commissure: o. I 1 , anterior; o P, posterior 

 lobes of corpora quadrigemina; 0. th, optic thalamus; otr, optic tract , / co, pos- 

 terior commissure; / fo, posterior peduncles of cerebellum; / va, fibres of pons 

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

 stria longitudinalis; t s, tcenia semicircularis ; v. vn, valve of Vieussens; V s , 

 third ventricle; w*, fourth ventricle. (From Parker's Zootomy.') 



masses of mixed gray and white matter forming the lateral 

 portions of the diencephalon ; they are connected together 



