The elaboration of a notochord and a dorsal nerve chord,the key developmental event that marks the evolution of the chordates,is referred to as

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The development of notochord and dorsal nerve cord is a part of neurulation, which is the process that forms the neural tube. This is the key event that distinguishes the chordates from other animals, as they have a distinct nerve cord running along their backs. Morphogenesis is the process of shaping cells and tissues to form an organism, organogenesis is the formation of organs from the germ layers, gastrulation is the formation of the gastrula from the blastula, and neural crest formation is a later event in development.

The Elaboration of a Notochord and a Dorsal Nerve Chord,the