THE RABBIT. 



371 



7f 



o.th 



FIG. 71. Lepus cuniculus. Two dissections of the brain, from 

 above (next. size). 



In A the left cerebral hemisphere is dissected down to the level of the 

 corpus callosum : on the right side the lateral ventricle is exposed. la 

 B the cerebral hemispheres are dissected down 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 

 its left posterior pillar : the cerebellum is removed with the exception of 

 a part cf its right lateral lobe. 



a.co, anterior commissure : a.fo, anterior pillar of fornix : a.pu, anterior 

 peduncles of cerebellum : b.fo, body of fornix : cb l , superior vermis 

 of cerebellum : cb'* t its lateral lobe : c.gn, corpus geniculatum : c.h, 

 cerebral hemisphere : ch.pl, choroid plexus : cp.cl, corpus callosum : 

 cfi.s, corpus striatum : c.rs, corpus restiforme : d.p, dorsal pyramid : 

 Jl, flocculus: hp,m, hippocampus major: m.co, middle commissure: 

 0./ 1 , nates: o.l 1 , testes : o.th, optic thalamus : o.tr, optic tract: p.co, 

 posterior commissure : p.fo, posterior pillar of fornix : pn, pineal body : 

 pd.pn, peduncle of pineal body : p.pn, posterior peduncles of cere- 

 bellum : p.va, fibres of pons Varolii forming middle peduncles of 

 cerebellum: sp.lu, septum lucidum : st.l, stria longitudinalis : f.s, tasnia 

 semicircularis : v.vn, valve of Vieussens : ^.3, third ventricle: ^.4, 

 fourth ventricle. 



B B 2 



