. A text-book of embryology for students of medicine [electronic resource]. Embryology; Embryology. THE DEVELOPMENT OF THE EYE. 329 The outer extremity of the diverticulum expanding more rapidly than its base of attachment assumes the form of a vesicle with a narrow stalk (Fig. 161), the stalked condition. 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; , pri
. A text-book of embryology for students of medicine [electronic resource]. Embryology; Embryology. THE DEVELOPMENT OF THE EYE. 329 The outer extremity of the diverticulum expanding more rapidly than its base of attachment assumes the form of a vesicle with a narrow stalk (Fig. 161), the stalked condition. 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-. 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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