Neural Tube Closure

The neural tube closure constitutes a fundamental step in embryonic development, occurring from the epiblast. This process begins with the deposition of tissue on the epiblast, which closes to form an elongated structure. Beneath this formation is the hypoblast, playing a key role as a support for the endoderm. As the tube develops, it undergoes morphological transformations, passing through a flattening then a resumption of height, before reorganizing into a cordal structure.

At this stage, the notochord emerges as a cordal tube, integrating ecto-mesodermal characteristics while remaining essentially epiblastic. This development is crucial, as the notochord serves as a model for the formation of vertebrae, which develop around it. The dynamics of the notochord, which retains hypoblastic information while being primarily epiblastic, highlights the interconnection of embryonic tissues. This interaction is essential for the correct formation of vertebral structures and the establishment of the central nervous system, illustrating the importance of neural tube closure in embryonic development.