Embryonic Development: Invagination Process
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Questions and Answers

What is the term for the infolding of the cell sheath into the embryo?

  • Gastrulation
  • Morphogenesis
  • Invagination (correct)
  • Evagination
  • In which organism is Invagination observed during embryonic development?

  • Sea Urchin (correct)
  • Starfish
  • Snail
  • Frog
  • What is the resulting layer formed after Invagination in Sea Urchin embryonic development?

  • Endoderm (correct)
  • Mesoderm
  • Blastoderm
  • Ectoderm
  • Which of the following processes is the opposite of Invagination?

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

    What is the developmental process where Invagination plays a crucial role?

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

    Which process involves the movement of individual cells into the embryo?

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

    What is the term for the splitting of one cell sheath into two?

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

    Which process results in the expansion of one cell sheath over others?

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

    What is the process where the cell sheath intunes over the basal surface of the outer layer?

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

    Which of the following processes is NOT a type of gastrulation movement?

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

    Study Notes

    Invagination in Embryonic Development

    • Invagination refers to the infolding of the cell sheath into the embryo.
    • Invagination is observed during embryonic development in Sea Urchin.
    • After Invagination in Sea Urchin embryonic development, the resulting layer formed is the Archenteron.
    • The opposite process of Invagination is Evagination.
    • Invagination plays a crucial role in the developmental process of Gastrulation.

    Cell Sheath Movements During Embryogenesis

    • Invagination: Infolding of cell sheath into the embryo, observed in Sea Urchin endoderm.
    • Involution: Inturning of the sheath over the basal surface of the outer layer, seen in Amphibian mesoderm.
    • Ingression: Migration of individual cells into the embryo, exemplified by Drosophila neuroblasts and Sea urchin mesoderm.
    • Delamination: Splitting of one sheath into two, characteristic of Mammalian development.
    • Epiboly: Expansion of one cell sheath over others, observed in Amphibian ectoderm.

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    Description

    Understand the concept of Invagination in embryonic development, its observation in Sea Urchin, and its resulting layer. Also, learn the opposite process and its crucial role in development.

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