Archive image from page 859 of Cunningham's Text-book of anatomy (1914). Cunningham's Text-book of anatomy cunninghamstextb00cunn Year: 1914 ( Optic MgS vesicle' u?/:-?\ becoming Mf-'--- cupped jj- Outer layer of optic cup —jr-4 i- Inner layer of optic cup jflHp- Lens Optic stalk Chorioidal fissure Lens Fig. '01.—Sections through Portions of the Heads of Fcetal Rabbits, to illustrate the connexion of the optic cup with the fore-brain, and the invagination of the ectoderm to form the lens. Optic stalk nerve. The arteria centralis is prolonged forwards from the porus opticus through the vitr
Archive image from page 859 of Cunningham's Text-book of anatomy (1914). Cunningham's Text-book of anatomy cunninghamstextb00cunn Year: 1914 ( Optic MgS vesicle' u?/:-?\ becoming Mf-'--- cupped jj- Outer layer of optic cup —jr-4 i- Inner layer of optic cup jflHp- Lens Optic stalk Chorioidal fissure Lens Fig. '01.—Sections through Portions of the Heads of Fcetal Rabbits, to illustrate the connexion of the optic cup with the fore-brain, and the invagination of the ectoderm to form the lens. Optic stalk nerve. The arteria centralis is prolonged forwards from the porus opticus through the vitreous body, as a cone of branches, as far as the back of the lens. By the fifth or sixth month all these branches have disappeared except one, the arteria hyaloidea, which persists until the last month of foetal life, when it also atrophies, leaving only the canalis hyaloideus to indicate its position. The vitreous body is developed between the optic cup and the lens, and is derived partly from ectoderm and partly from mesoderm. It consists primarily of a series of fine protoplasmic fibres which project from the cells of the retinal layer of the cup and form a delicate reticular tissue. At first these fibres are seen in relation to the whole of the optic cup, but later they are limited to the ciliary region, where by a process of condensation they appear to form the zonula ciliaris. When the mesoderm reaches the cup through the chorioidal fissure it unites with this reticular tissue to form the vitreous body. The lens, at first in contact with the ectoderm from which it is derived, is soon separated from it by mesoderm, and then consists of a rounded vesicle with epithelial walls. The anterior wall remains as a single layer of cells—the anterior lens epithelium of the adult; the cells of the posterior wall become elongated into lens fibres, and by the forward growth of these the cavity of the vesicle is obliterated. This elongation into lens fibres is greatest at the centr
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