Archive image from page 76 of The development of the frog's. The development of the frog's egg; an introduction to experimental embryology . developmentoffro00morg Year: 1897 B â .i. D Fig. 23. âDevelopment of embryo, showing closure of blastopore and formation of anus. (After Ziegler.) verse grooves There is present on each side above the mouth a thickened ridge that forms the superior maxillary process. Below and behind the mouth a pair of ridges appear that meet in the middle line. These are the sub-maxillary processes which later form the lower jaw. A pair of depressions of the surface ec

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Archive image from page 76 of The development of the frog's. The development of the frog's egg; an introduction to experimental embryology . developmentoffro00morg Year: 1897 B â .i. D Fig. 23. âDevelopment of embryo, showing closure of blastopore and formation of anus. (After Ziegler.) verse grooves There is present on each side above the mouth a thickened ridge that forms the superior maxillary process. Below and behind the mouth a pair of ridges appear that meet in the middle line. These are the sub-maxillary processes which later form the lower jaw. A pair of depressions of the surface ectoderm below the mouth-area mark very early the

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