| 41. | This duct is formed when the ectoderm thickens into a cord and sinks into the underlying mesenchyme.
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| 42. | Expression in the head ectoderm will give rise to the nasal placodes and to the eye placodes.
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| 43. | A transplanted blastopore lip can convert ectoderm into neural tissue and is said to have an inductive effect.
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| 44. | These three " germ layers " are known as the ectoderm, mesoderm, and endoderm.
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| 45. | Now, as the ectoderm continues to elongate, the ectodermal cells of the neural plate fold inward.
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| 46. | The mesoderm forms at the same time as the other two germ layers, the ectoderm and endoderm.
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| 47. | Inhibition of BMPs allows neuroectoderm to arise from ectoderm, a process which eventually forms the neural plate.
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| 48. | Unlike the fore-and hindgut, which are derived from ectoderm, it has no cuticular lining.
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| 49. | Wnt6 is expressed by the overlying ectoderm and promotes the production of Paraxis, which facilitates the transition.
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| 50. | The ectoderm eventually forms the skin ( including hair and nails ), mucous membranes and nervous system.
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