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Early Human Embryo Development Quiz
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Early Human Embryo Development Quiz

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Questions and Answers

What is the opening of the gut tube at the cranial end of the embryo called?

  • Pharyngeal arches
  • Cranial endoderm
  • Neural tube
  • Stomodeum (correct)
  • What is the origin of the mesenchyme within each pharyngeal arch?

  • Endodermal layer
  • Neural crest cells (correct)
  • Mesodermal germ layer
  • Ectodermal layer
  • Which structure is lateral to the stomodeum and just above the cardiac bulge in the developing embryo?

  • Cranial nerve
  • 6 pairs of well-defined outgrowths (Pharyngeal Arches) (correct)
  • Mesenchyme
  • Neural tube
  • What happens to the 5th pharyngeal arch in the developing embryo?

    <p>It is either underdeveloped or merges with the 4th pharyngeal arch</p> Signup and view all the answers

    What is seen within the cranial end of the developing embryo at week 3?

    <p>Neural tube</p> Signup and view all the answers

    Which germ layer contributes the most to the mesenchyme within each pharyngeal arch?

    <p>Neural crest cells</p> Signup and view all the answers

    What is the structure that separates the pharyngeal arches on the inside in the developing embryo?

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

    Which cranial nerve is associated with each pharyngeal arch in the developing embryo?

    <p>Vagus nerve (CN X)</p> Signup and view all the answers

    At what week does the embryo develop the stomodeum, the opening of the gut tube at the cranial end?

    <p>Week 4</p> Signup and view all the answers

    What happens to the 5th pharyngeal arch in the developing embryo?

    <p>It merges with the 4th pharyngeal arch</p> Signup and view all the answers

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