. The Journal of comparative neurology and psychology. D il ?MS M ch op Fig. 45. B, trausverse section of the telencephalon of Necturus; C, ofhuman embryo; D, of human adult brain. 532 Journal of Comparative Neurology and Psychology. would pass through the optic chiasma and the interventricularforamina. No other plane would cut hoth roof plate and floor plateat the same level. Owing to the reduction of the ventral zone andthe enormous expansion of the dorsal zone of the telencephalon inall vertebrates, only a small part of the sections of a series can cutboth zones, but a section in th
. The Journal of comparative neurology and psychology. D il ?MS M ch op Fig. 45. B, trausverse section of the telencephalon of Necturus; C, ofhuman embryo; D, of human adult brain. 532 Journal of Comparative Neurology and Psychology. would pass through the optic chiasma and the interventricularforamina. No other plane would cut hoth roof plate and floor plateat the same level. Owing to the reduction of the ventral zone andthe enormous expansion of the dorsal zone of the telencephalon inall vertebrates, only a small part of the sections of a series can cutboth zones, but a section in the plane mentioned may be taken as thetrue or standard transverse section of the telencephalon. Figures45 A, B, C, D show such sections of the fish, amphibian and humanbrain. Summary and Conclusions. 1. The neural plate is bounded bj neural folds which meet infront at the terminal ridge. 2. The optic vesicles are evaginated from the dorsal part of theneural tube and are connected with one another by the primitiveoptic groove. 3. The optic chiasma is formed
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