Fig. 463. Diagram of developing lens and optic cup
The cells of the inner wall of the lens vesicle have begun to elongate to form lens fibers. The epithelium over the lens is the anlage of the corneal epithelium. The mesodermal tissue between the latter and the anterior wall of the lens vesicle is the anlage of the substantia propria cornea.
At first the lens vesicle is connected with the surface ectoderm, but about the eighth week a thin layer of mesoderm grows in between the lens vesicle and the surface ectoderm, completely separating them (Fig. 463). The ingrowth of the lens vesicle against the outgrowing optic vesicle has the effect as though a small hard ball (the lens vesicle) had been pressed into a larger soft ball (the optic vesicle) (Fig. 464) . The lens vesicle pushes the outer wall of the optic vesicle in against the inner wall, the optic vesicle thus becoming transformed into the two-layered optic cup (Figs. 462, 463).
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