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embryology questions

Discussion in 'MCAT Study Question Q&A' started by thebillsfan, Aug 2, 2009.

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  1. thebillsfan

    thebillsfan Unseasoned Veteran

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    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.
  2. RogueUnicorn

    RogueUnicorn rawr.

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    neural tube/plate = ectoderm
    notocord = mesoderm

    the other details you ask are more detailed than necessary

    you are generally correct with the timeline

    embryo/fetus distinction is kind of vague but i'd imagine it's after neurulation.. not going to be tested.

    blastocyst = cells of blastula

    trophoblast = various extraembryonic membranes & placenta
    ICM = every cell in body (this is where you get e-stem cells)
  3. thebillsfan

    thebillsfan Unseasoned Veteran

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    alright, if the other details are unnecessary, could you just confirm that the neural tube gives rise to the CNS? and what parts of the eye are ectoderm and mesoderm? I know that the retina and all that stuff is ecto, and i wouldve thought the the lens is ecto as well since its part of the eye but i think i read that the lens and everything anterior to the lens is meso
  4. RogueUnicorn

    RogueUnicorn rawr.

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    yes. surprisingly, the neural tube gives rise to neurons =). the eye thing is getting pretty detailed...
  5. thebillsfan

    thebillsfan Unseasoned Veteran

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    i dont think so. i had a question on it (not from an aamc but still)
  6. RogueUnicorn

    RogueUnicorn rawr.

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    the lens of the eye is fair game, but not the rest

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