WK 6: Blastulation Stage of Embryonic Development
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Questions and Answers

During what stage of embryogenesis is the morula compacted to form a blastocyst?

  • Gastrulation
  • Implantation
  • Blastulation (correct)
  • Cleavage

    • What is the primary function of the notochord during embryogenesis?

  • Partitioning of the endoderm into definitive layers
  • Induction of the neural groove in the overlying ectoderm (correct)
  • Formation of the neural tube
  • Differentiation of the mesoderm into somites

    • What is the term for the process by which the blastocyst breaks out of the zona pellucida?

  • Implantation
  • Compaction
  • Hatching (correct)
  • Gastrulation

    • What percentage of children born have defects due to abnormal embryonic processes?

    <p>3-4%</p> Signup and view all the answers

    During gastrulation, what layer of cells forms from the epiblast?

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

    During which phase of embryogenesis does the formation of the primitive streak occur?

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

    What is the purpose of studying embryology?

    <p>To understand how things go wrong during embryonic development</p> Signup and view all the answers

    What is the primary consequence of the failure of neural tube closure at the rostral neuropore?

    <p>Little to no brain matter</p> Signup and view all the answers

    What is the term for the thickening of hypoblast cells that forms the site of the future mouth region?

    <p>Prechordal plate</p> Signup and view all the answers

    Which phase of embryogenesis involves the formation of the three primary germ layers?

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

    What is the result of abnormal embryonic processes?

    <p>Children are born with defects</p> Signup and view all the answers

    During which week of embryogenesis does the embryo complete differentiation to a bilaminar disc?

    <p>Week 2</p> Signup and view all the answers

    What is the primary function of the three germ layers?

    <p>Defining future derivatives</p> Signup and view all the answers

    What is the relationship between embryonic folding and the development of major organs?

    <p>Embryonic folding is necessary for the development of major organs</p> Signup and view all the answers

    What is the primary consequence of embryo folding in the sagittal plane?

    <p>Formation of the head and tail</p> Signup and view all the answers

    What is the term for the process of becoming trilaminar, which forms the primary germ layers?

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

    What is the purpose of the cleavage phase of embryogenesis?

    <p>To divide the zygote into multiple cells</p> Signup and view all the answers

    What is the relationship between embryo folding and the development of major organs?

    <p>Embryo folding facilitates the development of major organs</p> Signup and view all the answers

    What is the primary outcome of gastrulation in embryonic development?

    <p>Differentiation of the three primary germ layers</p> Signup and view all the answers

    During which week of embryogenesis does the embryo undergo gastrulation?

    <p>Week 3</p> Signup and view all the answers

    What is the significance of the three primary germ layers in embryonic development?

    <p>They form the basis of all body cell derivatives</p> Signup and view all the answers

    What is the primary consequence of embryo folding in the transverse plane?

    <p>Formation of the body walls</p> Signup and view all the answers

    During which phase of embryogenesis do fertilization, cleavage, and implantation occur?

    <p>Week 1</p> Signup and view all the answers

    What is the significance of embryonic folding in the sagittal plane?

    <p>Positioning of the head and tail</p> Signup and view all the answers

    What is the process by which a fertilised egg undergoes progressive divisions, still encased within the zona pellucida?

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

    During which stage of embryogenesis do the embryonic layers (ectoderm, endoderm, and mesoderm) differentiate?

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

    What is the result of the sperm penetrating through the zona pellucida and depositing its nuclear contents?

    <p>A zygote with a single set of chromosomes</p> Signup and view all the answers

    What is the significance of Gastrulation in the development of major organs?

    <p>It forms the embryonic layers that give rise to major organs</p> Signup and view all the answers

    What is the relationship between embryonic folding and the development of major organs?

    <p>Folding shapes the embryo and establishes the position of major organs</p> Signup and view all the answers

    What is the purpose of the zona pellucida and the corona radiata surrounding the egg?

    <p>To protect the egg from multiple sperm penetration</p> Signup and view all the answers

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