Follow the successive stages of neural tube formation. What changes occur with ectoderm during neurula formation?

The formation of a complex of axial organs — the neural tube, chords, and intestines — is called organogenesis. The ectoderm of the dorsal side under the influence of the anlage of the chord bends along the midline, turning into a groove, and the ectoderm, located to the right and to the left of it, begins to grow on its edges. The groove – the primordium of the nervous system – is submerged under the ectoderm, and its edges are closed. This forms the neural tube. The rest of the ectoderm is the rudiment of the skin. The embryo at this stage is called neurula.
The dorsal part of the endoderm under the nerve anlage separates and forms a chord. From the remaining endoderm, mesoderm and intestinal epithelium are formed. Further differentiation of cells leads to the formation of derivatives of the germ layers – tissues and organs.

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