. The elements of embryology . Embryology. 384 DEVELOPMENT OF ORGANS IN MAMMALIA. [CHAP. Primitively the Mammalian cerebrum, like that of the lower Vertebrata, is quite smooth. In some of the Mammalia, Monotremata, Insectivora, etc., this condition is retained nearly throughout life, while m the majority of Mammalia a more or less complicated system of fissures Fig. 126. '7n i. .,Cl Latbbal View of the Brain of a Calf Embryo or 5 cm. (After Mihalkovics.) The outer wall of the hemisphere is removed, so as to give a view of the interior of the left lateral ventricle. As. out wall of hemisphere;
. The elements of embryology . Embryology. 384 DEVELOPMENT OF ORGANS IN MAMMALIA. [CHAP. Primitively the Mammalian cerebrum, like that of the lower Vertebrata, is quite smooth. In some of the Mammalia, Monotremata, Insectivora, etc., this condition is retained nearly throughout life, while m the majority of Mammalia a more or less complicated system of fissures Fig. 126. '7n i. .,Cl Latbbal View of the Brain of a Calf Embryo or 5 cm. (After Mihalkovics.) The outer wall of the hemisphere is removed, so as to give a view of the interior of the left lateral ventricle. As. out wall of hemisphere; st. corpus striatum ; am. hippo- campus major (cornu ammonis) ; d. choroid plexus of lateral ventricle; fm. foramen of Monro ; op. optic tract; in. in- fundihulum; nh. mid-brain ; c6. cerebellum ; roof of fourth ventricle; ps. pons Varolii, close to which is the fifth nerve with Gasserian ganglion. is developed on the surface. The most important, and first formed, of these is the Sylvian fissure. It arises at the time when the hemispheres, owing to their growth in front of and behind the corpora striata have assumed somewhat the form of a bean. At the root of the hemispheres—the hilus of the bean—there is formed a. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Foster, M. (Michael), Sir, 1836-1907; Balfour, Francis M. (Francis Maitland), 1851-1882; Sedgwick, Adam, 1854-1913; Heape, Walter, 1855-1929. London ; New York : Macmillan
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