In spite of the fact that causal embryology dealt extensively with the development of the eye in vertebrates, the iris attracted the attention of investigators only as a source of lens restitution in the course of Wolffian regeneration (Reyer, 1954, 1962; Goss, 1965; Scheib, 1965; Yamada, 1966). This is shown by the absence of sections on iris development in recent reviews devoted to the experimental analysis of eye development (Twitty, 1955; Lopashov & Stroeva, 1961 ; Coulombre, 1961, 1965a, b). The present communication reports a study of the development of the neural layers of iris and ciliary body in rat embryos.

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