Third Week of Development: Trilaminar Germ Disc Quiz
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Questions and Answers

During the third week of gestation, what is the most characteristic event that occurs?

  • Formation of the amniotic cavity
  • Differentiation of the trophoblast into two layers
  • Establishment of uteroplacental circulation
  • Gastrulation (correct)

    • What is the first indication that a woman may be pregnant?

  • Cessation of menstruation (correct)
  • Formation of the amniotic cavity
  • Differentiation of the trophoblast into two layers
  • Establishment of uteroplacental circulation

    • What does gastrulation establish in embryos?

  • The three germ layers (ectoderm, mesoderm, and endoderm) (correct)
  • The beginning of uteroplacental circulation
  • Differentiation of the trophoblast into two layers
  • Formation of the chorionic cavity

    • At what point can a normal pregnancy be detected with ultrasonography?

    <p>Approximately 5 weeks after conception</p> Signup and view all the answers

    What is the name of the cavity formed during the third week of development that will surround the developing embryo?

    <p>Amniotic cavity</p> Signup and view all the answers

    What is the beginning of morphogenesis and formation of the three germ layers in embryos called?

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

    What is the cephalic end of the streak referred to as?

    <p>Primitive node</p> Signup and view all the answers

    What is the inward movement of cells beneath the epiblast known as?

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

    Which factor controls the migration and specification of cells during embryonic development?

    <p>Fibroblast Growth Factor (FGF8)</p> Signup and view all the answers

    What does the embryonic ectoderm give rise to?

    <p>Epidermis, nervous systems, and neural crest cells</p> Signup and view all the answers

    What does the embryonic endoderm give rise to?

    <p>Epithelial linings of respiratory and alimentary tracts, and glandular cells</p> Signup and view all the answers

    What does the embryonic mesoderm give rise to?

    <p>Skeletal muscles, blood cells, and extraembryonic mesoderm</p> Signup and view all the answers

    What covers the yolk sac and amnion?

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

    Where is the prechordal plate located?

    <p>Between the tip of the notochord and the oropharyngeal membrane</p> Signup and view all the answers

    What does the oropharyngeal membrane consist of?

    <p>Tightly adherent ectoderm and endoderm cells without mesoderm</p> Signup and view all the answers

    What is the notochord derived from?

    <p>Epiblast and hypoblast</p> Signup and view all the answers

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