Embryonic Development: Blastocyst Formation
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Questions and Answers

What is the function of the glycoprotein found on the surface of blastomeres?

  • Involved in compaction (correct)
  • Involved in fertilization
  • Involved in gastrulation
  • Involved in neurulation
  • What is the term for the inner cell mass after blastocyst formation?

  • Morula
  • Embryoblast (correct)
  • Trophoblast
  • Zygote
  • What must degenerate for implantation to occur?

  • Zona pellucida (correct)
  • Blastocyst
  • Embryoblast
  • Trophoblast
  • Where does the blastocyst usually implant within the uterus?

    <p>Posterior superior wall</p> Signup and view all the answers

    At what stage of the menstrual cycle does implantation occur?

    <p>Progestational phase</p> Signup and view all the answers

    What is the most common site of an ectopic pregnancy?

    <p>Ampulla of the uterine tube</p> Signup and view all the answers

    What happens to the secondary oocyte if fertilization does not occur?

    <p>It degenerates</p> Signup and view all the answers

    In which layer of the endometrium does the blastocyst implant?

    <p>Functional layer</p> Signup and view all the answers

    What is the purpose of the basal layer of the endometrium?

    <p>To serve as the source of regeneration of the functional layer</p> Signup and view all the answers

    What is the result of the series of mitotic divisions during cleavage?

    <p>The decrease in size of individual blastomeres</p> Signup and view all the answers

    Why must the zona pellucida degenerate for implantation to occur?

    <p>To prevent the embryo from implanting in the uterine tube</p> Signup and view all the answers

    What is the origin of the mitochondrial DNA in human adult cells?

    <p>Maternal origin only</p> Signup and view all the answers

    At which stage of development is the lacunar network formed?

    <p>Day 13 blastocyst</p> Signup and view all the answers

    What is the term for the type of implantation where the blastocyst is completely implanted within the endometrium?

    <p>Interstitial implantation</p> Signup and view all the answers

    What is the name of the cavity that forms in the extraembryonic mesoderm and coalesces to form the extraembryonic coelom?

    <p>Extraembryonic spaces</p> Signup and view all the answers

    What is the term for the thin echogenic line observed in the sonogram at about week 3?

    <p>Embryonic disk</p> Signup and view all the answers

    What is the term for the process by which the embryoblast receives maternal nutrients?

    <p>Diffusion</p> Signup and view all the answers

    What is the term for the structure that forms the connection between the embryo and the trophoblast?

    <p>Connecting stalk</p> Signup and view all the answers

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