Archive image from page 93 of The development of the frog's. The development of the frog's egg; an introduction to experimental embryology . developmentoffro00morg Year: 1897 i';f â ~;S'r'xi' . ''''⢠l'»s5t'fl'ial (C) sections through an embryo with spina bitida. (After M. Half medullary plate. N. Half uotochorcl. Y. Yolk. duced an embryo Avith an exposure of yolk in the mid-dorsal line. The exposure is more or less extensive, according to the extent of fusion anteriorly of the blastopore, and to the extent of fusion forwards of the lateral and ventral liiDs. These embryos Avitli
Archive image from page 93 of The development of the frog's. The development of the frog's egg; an introduction to experimental embryology . developmentoffro00morg Year: 1897 i';f â ~;S'r'xi' . ''''⢠l'»s5t'fl'ial (C) sections through an embryo with spina bitida. (After M. Half medullary plate. N. Half uotochorcl. Y. Yolk. duced an embryo Avith an exposure of yolk in the mid-dorsal line. The exposure is more or less extensive, according to the extent of fusion anteriorly of the blastopore, and to the extent of fusion forwards of the lateral and ventral liiDs. These embryos Avitli spina bifida show that the material for the mid-dorsal surface of the embryos appears first as a ring around the equator of the egg or a little below the equatoi If this material is prevented from reaching the mid-dorsal surface, it differentiates in situ. Hence the production of a ring-like medullary plate and a double notochord.
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