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Twins in the Uterus – Embryo Folding, Embryonic Cavities and Placenta

by John McLachlan, PhD
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    00:01 for genetic defects. Now, the things that we were looking at are obviously very different if you have a twin pregnancy, as we discussed in another lecture.

    00:09 Here, we can see some arrangements of different versions of the membranes in the light of what we’ve been seeing about the development of these species. So you can see on the left-hand side, if there is the early separation into two separate blastocysts, then each of those will have separate membranes. So a third of the twins that we get are identical, and, of course, that number, as we said previously, depends on in vitro fertilization which can increase the number of non-identical twin pregnancies. The ones which are found very early on may well actually fuse together, and you can see that in the form of conjoined twins. But we need to go to see a bit more about the membranes themselves. So you can see the image labeled A that completely separate development has taken place. There are two amniotic cavities and two chorionic cavities and so you would describe that as a diamniotic, dichorionic pregnancy. In the image marked B, by contrast, there are still two amniotic cavities but only one chorionic cavity. So that would be a diamniotic, monochorionic cavity. This image C is the same as the previous one as diamniotic, monochorionic.

    01:30 But you can also see that you can have twins developing inside a single amniotic cavity.

    01:38 So that’s a monoamniotic cavity. Finally, conjoined twins are within the same amniotic cavity completely. Now, let’s look at the placenta itself.


    About the Lecture

    The lecture Twins in the Uterus – Embryo Folding, Embryonic Cavities and Placenta by John McLachlan, PhD is from the course Embryology: Early Stages with John McLachlan.


    Author of lecture Twins in the Uterus – Embryo Folding, Embryonic Cavities and Placenta

     John McLachlan, PhD

    John McLachlan, PhD


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