. Biology of the vertebrates : a comparative study of man and his animal allies. Vertebrates; Vertebrates -- Anatomy; Anatomy, Comparative. Lens-7 Pigment Layer Nervous Layer Optic Stalk A B C Fig. 706. Outgrowth of the optic vesicles and formation of the lens in the chick. (After Duval.). Retina Pigment Layer Nervous Layer Optic Cup Lens Vesicle groove is closed into a tube, the diencephalon gives rise to two outpocketings (Fig. 706). Each of these soon differentiates into an enlarged distal portion, the optic vesicle, and a constricted prox- imal optic stalk which connects the ves- icle with
. Biology of the vertebrates : a comparative study of man and his animal allies. Vertebrates; Vertebrates -- Anatomy; Anatomy, Comparative. Lens-7 Pigment Layer Nervous Layer Optic Stalk A B C Fig. 706. Outgrowth of the optic vesicles and formation of the lens in the chick. (After Duval.). Retina Pigment Layer Nervous Layer Optic Cup Lens Vesicle groove is closed into a tube, the diencephalon gives rise to two outpocketings (Fig. 706). Each of these soon differentiates into an enlarged distal portion, the optic vesicle, and a constricted prox- imal optic stalk which connects the ves- icle with the diencephalic region. Next the terminal part of the vesicle in- vaginates to form a two-layered optic cup with its concavity toward the sur- face of the body. The inner layer of the cup eventually becomes the nervous portion of the retina, while the cup's outer layer forms the pigment layer of the retina. As the primitive double cup is form- ing, a portion of its ventral brim is in- volved in the invagination so that a deep notch, the choroid fissure, devel- ops in this region (Fig. 707). This infolding also continues along the optic stalk to form a ventral groove which extends as far as the diencephalic 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 Walter, Herbert Eugene, b. 1867; Sayles, Leonard Perkins, 1902-. New York : Macmillan Co.
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