| 21. | The top layer is now called the ectoderm.
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| 22. | The endoderm of the archenteron will fuse with the ectoderm of the blastocoel wall.
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| 23. | The embryo is covered on the dorsal surface by a layer of cells called ectoderm.
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| 24. | BMP4 antagonizes organizer tissue and is expressed in early development in ectoderm and mesoderm tissue.
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| 25. | Neural development happens in the dorsal ectoderm.
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| 26. | This represents the point of transition between the hindgut and the ectoderm in the embryo.
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| 27. | In triploblastic organisms, the three germ layers are called endoderm, ectoderm, and mesoderm.
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| 28. | The dorsal neural tube is patterned by BMPs from the epidermal ectoderm flanking the neural plate.
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| 29. | As the ectoderm proliferates, the notochord is dragged into the middle of the developing embryo.
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| 30. | By the 10 mm stage, the lens vesicle has completely separated from the surface ectoderm.
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