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Prenatal Development Stages
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Prenatal Development Stages

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Questions and Answers

What is the key feature of the germinal stage of prenatal development?

  • Formation of all major organs
  • Formation of the placenta (correct)
  • Increased vulnerability to teratogens
  • Growth and functional differentiation of organs
  • What occurs during the embryonic stage of prenatal development?

  • Intense cell proliferation, migration, and differentiation (correct)
  • Growth and functional differentiation of organs
  • Termination of pregnancy
  • Formation of the placenta
  • What is the period during which the embryo is most vulnerable to teratogens?

  • Embryonic stage (correct)
  • After birth
  • Fetal stage
  • Germinal stage
  • What is the consequence of factors that interfere with the implantation process during the germinal stage?

    <p>Termination of pregnancy</p> Signup and view all the answers

    During which stage of prenatal development does the growth and functional differentiation of organs occur?

    <p>Fetal stage</p> Signup and view all the answers

    How long does the embryonic stage of prenatal development last?

    <p>From the third to the eighth week of pregnancy</p> Signup and view all the answers

    Study Notes

    Prenatal Development Stages

    • Prenatal development is divided into three stages: germinal, embryonic, and fetal.

    Germinal Stage

    • Starts with conception and ends approximately 2 weeks later with implantation of the embryo into the uterine wall.
    • Key feature of this period: formation of the placenta.
    • Interference with implantation process (genetic or environmental factors) leads to pregnancy termination.

    Embryonic Stage

    • Comprises the period between the third and eighth weeks of pregnancy.
    • Characterized by intense cell proliferation, migration, and differentiation leading to establishment of all major organs.
    • Increased vulnerability to teratogens during this period can induce major developmental defects, many of which are incompatible with life.

    Fetal Stage

    • Lasts from the ninth week of pregnancy to birth.
    • Characterized by growth and functional differentiation of organs formed during the embryonic period.

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    Description

    Learn about the three stages of prenatal development: germinal, embryonic, and fetal stages. Understand the key features of each stage, including implantation and placenta formation.

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