. A text-book of embryology for students of medicine [electronic resource]. Embryology; Embryology. METAMORPHOSIS OF THE FORE-BRAIN VESICLE. 311 the foramen of Monro. When, further, one considers the relation of the fimbria to the apparent opening into the ven- tricle, through which the pia mater is invaginated (the trans- verse fissure), it is explained why the edge of the fornix appears as a narrow white band, not only as viewed from within the ventricular cavity, but also in a mesial section of the brain (Fig. 156, C). A. Sy unc calc Fig. 156.—Fetal brain at the beginning of the eighth mont
. A text-book of embryology for students of medicine [electronic resource]. Embryology; Embryology. METAMORPHOSIS OF THE FORE-BRAIN VESICLE. 311 the foramen of Monro. When, further, one considers the relation of the fimbria to the apparent opening into the ven- tricle, through which the pia mater is invaginated (the trans- verse fissure), it is explained why the edge of the fornix appears as a narrow white band, not only as viewed from within the ventricular cavity, but also in a mesial section of the brain (Fig. 156, C). A. Sy unc calc Fig. 156.—Fetal brain at the beginning of the eighth month (Mihalkovics) : A, superior, B, lateral, C, mesial surface : E, fissure of Rolando ; pre, precentral fissure ; Sy, Sylvian fissure ; intp, interparietal fissure ; poc, parieto-occipital Assure : pll, parallel fissure ; callm, callosomarginal fissure; unc, uncus ; calc, calcarine fissure. Another important region of fusion of the opposed mesial surfaces of the hemispheres is that corresponding to the future corpus callosum. Throughout this area the hemispheres closely unite with each other. The line of fusion begins at the bases of the vesicles, some little distance in front of the anterior parts of the fimbriae (Fig. 155, ), and after passing upward and forward, curves horizontally backward. 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 Heisler, John Clement; Waterstone, David, former owner; Duke-Elder, Stewart, 1898-1978, former owner; University College, London. Library Services. Philadelphia : W. B. Saunders Company
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