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 (A)</p> Signup and view all the answers

At what stage of the menstrual cycle does implantation occur?

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

What is the most common site of an ectopic pregnancy?

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

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

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

In which layer of the endometrium does the blastocyst implant?

<p>Functional layer (C)</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 (D)</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 (C)</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 (A)</p> Signup and view all the answers

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

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

At which stage of development is the lacunar network formed?

<p>Day 13 blastocyst (D)</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 (B)</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 (C)</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 (C)</p> Signup and view all the answers

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

<p>Diffusion (A)</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 (D)</p> Signup and view all the answers

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