. A text-book of embryology for students of medicine [electronic resource]. Embryology; Embryology. Fig. lf>l —Part of a section through the head of an early human embryo, show- ing the connection of the primary optic vesicles with the fore-brain (His): olf, olfactory area of epiblast; , part of fore-brain which gives rise to cerebral hem- ispheres; th, thalamencephalon; , primary optic vesicles. being present in the fourth week. The vesicles grow in the outward direction and form a prominence on each side of the head. There being no brain-case at this time, they lie imme-. Fig. 1
. A text-book of embryology for students of medicine [electronic resource]. Embryology; Embryology. Fig. lf>l —Part of a section through the head of an early human embryo, show- ing the connection of the primary optic vesicles with the fore-brain (His): olf, olfactory area of epiblast; , part of fore-brain which gives rise to cerebral hem- ispheres; th, thalamencephalon; , primary optic vesicles. being present in the fourth week. The vesicles grow in the outward direction and form a prominence on each side of the head. There being no brain-case at this time, they lie imme-. Fig. 162.—Three successive stages of development of the eye, showing forma- tion of secondary optic cup and crystalline lens in human embryos of 4 mm. (.4), 6 mm. (B), and 8 mm. (C), (Tourneux): a, a, primitive optic vesicles; b, external layer of secondary optic cup (future pigment-layer of retina); c, inner layer of cup (retina proper); d, lens-pit (thickened and depressed ectoderm); e, lens-vesicle. diately under the epidermis, separated from it by only a thin layer of embryonal connective tissue. This lateral position of the optic vesicles is characteristic of the early stages of development. After the end of the first month the eyes. 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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Keywords: ., bookcentury1900, bookdecade1900, bookpubli, booksubjectembryology
