Question

When does the notochord developed? From where the notochord originate?

Answer 1

In anatomy, the notochord is a flexible rod made out of a material similar to cartilage. If a species has a notochord at any stage of its life cycle, it is, by definition, a chordate. In vertebrates the notochord becomes part of the vertebral column.

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Answer 2

Answer:

A notochord is a longitudinal flexible rod of cells that in the lowest chordates (such as a lancelet or a lamprey) and in the embryos of the higher vertebrates forms the supporting axis of the body.

It originates during embryonic stage of some chordates. While it originates from the mesoderm.