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Fig. 465. Successive stages in the development of the lens in the rabbit embryo

Rabl.

a-e - are from embryos of from 11.5 to 12 days
f - at end of 12th day
g - during the 13th day
h - between the 13th and 14th days
i - from an embryo of 11 mm.

The lens area is thicker at its center than at its periphery and when the center of the lens area becomes the bottom of the lens depression and later the posterior wall of the lens vesicle this greater thickness is maintained. In fact, the posterior wall of the vesicle becomes still thicker so that it projects into the cavity of the lens vesicle as an eminence (Fig. 465, g.). In the chick the lens vesicle is hollow. In man and in Mammals generally it is more or less filled with cells. These, however, degenerate and take no part in the formation of the permanent lens. Comparing the posterior with the anterior wall of the lens at this stage, the latter is seen to be composed of a single layer of cuboidal cells, the anlage of the anterior epithelium of the lens (Figs. 463, 465, g, h, i).

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