The brain as an organ of mind . Hemispheres cut off—above the level of the Ventricle on the left, and so as to show this cavity on theright side. (Owen, after Tiedemann.) b, Corpus callosum ; c, c, bottom of surfacefissures or sulci; d, k, Corpus Striatum; h. Hippocampus, with its unusuallybioad free border or toenia (i) continued into the Fornix ; g, Thalamus. referred to in Reptiles and Birds, where they first showthemselves as projections developing from the upper andinner aspects of the Cerebral Peduncles : in Quadrupeds,however, owing to the backward extension of the CerebralHemispheres,
The brain as an organ of mind . Hemispheres cut off—above the level of the Ventricle on the left, and so as to show this cavity on theright side. (Owen, after Tiedemann.) b, Corpus callosum ; c, c, bottom of surfacefissures or sulci; d, k, Corpus Striatum; h. Hippocampus, with its unusuallybioad free border or toenia (i) continued into the Fornix ; g, Thalamus. referred to in Reptiles and Birds, where they first showthemselves as projections developing from the upper andinner aspects of the Cerebral Peduncles : in Quadrupeds,however, owing to the backward extension of the CerebralHemispheres, they seem to become included within theseand to project into the inner part of the floor of eachLateral Ventricle. But in reality they lie outside theseparts. They are overlapped by the velum interpositum,a membrane constituting the roof of the Third Ventricle. 270 THE BRAIN OF QUADRUPEDS AND and also by the * fornix and lyra/ tlie description ofwhich will shortly follow.* Between the contiguous inner surfaces of the Thalami. Fig. 87.—The Cerebral Hemispheres of the Dog, , after division of theCorpus Callosum, so as to expose the Ventricles and Basal Ganglia. (Fen-icr.)1, Internal surface of left Hemisphere ; 2, Corpus Striatum ; 3, Thalamus ; 4, 5,corpora quadrigemina ; G, anterior pillar of the fornix, divided on tlic left, undividedon the right side (12); 7, the third ventricle, exposed by drawing the thalamiasunder; 8, the upper surface of the Cerebellum; 9, olfactory lobe or bulb; 10,anterior commissure ; 11, corpus callosum, divided; 13, middle commissure, ex-tending across the third ventricle ; 14, pineal body, lying over and concealing theposterior commissure ; 15, descending cornu of the lateral ventricle. there is a narrow space known as the Third Ventricle(figs. 72, p; 87, 7). It is situated below the level of theLateral Ventricles, though each of these opens into it * By reference to fig. 87, it will be seen that the fornix (12)constitutes the inner an
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