. The anatomy of the frog. Frogs -- Anatomy; Amphibians -- Anatomy. THE CEREBRAL HEMISPHERES. 157 a. External form (Figs. 98, 102, 103 He and ). The two cerebral hemispheres form tog-ether the largest section of the brain ; from above they are seen to be separated by a dorsal lon- gitudinal fissure, which is here well marked : each hemisphere is an ovoid body with the smaller end directed forwards and continuous with the corresponding olfactory lobe; the Fig. 106. posterior end forms one half of the anterior boundary of the thalamencephalon. The olfactory lobes are two elongated, rounded b
. The anatomy of the frog. Frogs -- Anatomy; Amphibians -- Anatomy. THE CEREBRAL HEMISPHERES. 157 a. External form (Figs. 98, 102, 103 He and ). The two cerebral hemispheres form tog-ether the largest section of the brain ; from above they are seen to be separated by a dorsal lon- gitudinal fissure, which is here well marked : each hemisphere is an ovoid body with the smaller end directed forwards and continuous with the corresponding olfactory lobe; the Fig. 106. posterior end forms one half of the anterior boundary of the thalamencephalon. The olfactory lobes are two elongated, rounded bodies directly continuous with the cor- responding cerebral hemispheres, and like- wise partially separated in the median line by a dorsal longitudinal fissure : at the section the lower division point of union of the cerebral hemispheres "^ «^'^«^ pituitary budy (magnified ^ . ,! 11 360 times) ; from Stieda. and olfactory lobes is a ramtly marked a Tubes lined with epitiieiium. X -i • b Blood-vesseW. transverse depression. On the ventral surface the parts are again marked off from one another by a corresponding ventral longitudinal fissure and a transverse groove; the two longitudinal fissures being* continuous, anteriorly, between the olfactory lobes. The cerebral hemispheres appear to be more widely separated behind (Fig. J02) than is the case on the dorsal surface, and in the space so formed is the lamina termhialis {Lt). Seen from the side, the slight depres- sion of the upper surface, between the cerebral hemispheres and the olfactory lobes, is seen to be continued do^Aaiwards and slightly backwards to join the corresponding groove on the inferior surface. The longitudinal fissures are shallow and do not meet, except at one point, at about the middle of the cerebral hemispheres (Fig. 105). The olfactory bulbs arise superficially (Figs. 102, 103 /' and ) from the whole length of the olfactory lobe, between the anterior extremity (/) and the posterio
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