I've tried looking this up, but am having trouble differentiating whats important and what isnt important to know. so here goes what's the relationship between neural tube, neural plate, notochord, and nerve cord? which is part of which embryonic germ layer? which induces which? of the ones that arise in the ectoderm, which comes first and last? is the following the correct sequence: zygote, cleavage leading to morula, blastulation leading to blastula, gastrulation leading to gastrula (with a blastopore which eventually forms the anus in vertebrates). gastrulation gives rise to embryonic germ layers, and then organogenesis occurs. is that straight? when does it go from being called an embryo to a fetus? whats the diff between a blastocyst and blastocoel? also, when does the trophoblast and innercell mass come into play. thanks in advance.