what is formed to begin the nervous system?

Question

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Answer 1

The nervous system is formed from the embryonic neural tube that is itself formed by invagination of the neural groove, with the neural folds eventually fusing over it, giving rise to the tube.

Answer 2

Well the CNS originates from the neural plate in a developing fetus, a region of the ectoderm, which is the most external of the three layer of an embrio. Then during development, the neural plate folds and forms the neural tube, the internal cavity of the neural tube will form in to the ventricular system. The other regions of the neural tube will differentiate progressively into transversal systems and it goes on.