. The elements of Embryology,. v.] THE OPTIC CUP. 97 involuted epiblast. This cup, in order to distinguisli its cavity from that of the original optic vesicle, is generally called the secondary optic vesicle. We may, for the sake of brevity, speak of it as the optic cup; in reality it never is a vesicle, since it always remains widely open in front. Of its double walls the inner or anterior (Fig. 27 B, r) is formed from the front portion, the outer or posterior (Fig. 27 B, u) from the hind portion of the wall of the primary optic vesicle. The inner or anterior (?â ), which very speedily become
. The elements of Embryology,. v.] THE OPTIC CUP. 97 involuted epiblast. This cup, in order to distinguisli its cavity from that of the original optic vesicle, is generally called the secondary optic vesicle. We may, for the sake of brevity, speak of it as the optic cup; in reality it never is a vesicle, since it always remains widely open in front. Of its double walls the inner or anterior (Fig. 27 B, r) is formed from the front portion, the outer or posterior (Fig. 27 B, u) from the hind portion of the wall of the primary optic vesicle. The inner or anterior (?â ), which very speedily becomes thicker than the other, is converted into the retina; in the outer or posterior [u), which remains thin, pigment is eventually deposited, and it ultimately becomes the tesselated pigment-layer of the choroid. Fig. 27. 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, Michael. London : Macmillan
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Keywords: ., bookcentury1800, bookdecade1870, bookpublisherlondo, bookyear1874
