How can you tell the difference between the neural plate, neural fold and neural tube stages in the frog?

How can you tell the difference between the neural plate, neural fold and neural tube stages in the frog? How can you distinguish the various brain compartments? (e.g. prosencephalon, mesencephalon, rhombencephalon) What portion of the brain does the optic cup originate from (future eye and lens) In the chicken, why does the primitive streak still

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