Human Anatomy & Physiology - Developmental Anatomy Quiz
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Questions and Answers

Which of the following is NOT a function of the extraembryonic membranes?

  • Facilitating gas exchange
  • Removing and storing waste materials
  • Providing nutrition to the embryo
  • Initiating neurulation and notochord formation (correct)

    • What is the primary function of the yolk sac in human embryonic development?

  • Initiating neurulation
  • Forming the notochord
  • Storing yolk as a nutrient source
  • Being an important site for early blood cell and blood vessel formation (correct)

    • Which of the following statements about the bilaminar embryonic disc is correct?

  • It is formed from the trophoblast layer alone.
  • It is a flat disc composed of the hypoblast and epiblast layers. (correct)
  • It develops into the extraembryonic membranes.
  • It initiates the formation of the notochord and neural tube.

    • Which of the following extraembryonic membranes is formed from and continuous with the hypoblast layer?

    <p>Yolk sac</p> Signup and view all the answers

    What is the function of the cloacal membrane during embryonic development?

    <p>Separating the primitive gut from the neural tube</p> Signup and view all the answers

    Which of the following statements about the amnion is correct?

    <p>It is formed from and continuous with the epiblast layer.</p> Signup and view all the answers

    Which of the following structures is responsible for the formation of the notochord during embryonic development?

    <p>Embryonic disc</p> Signup and view all the answers

    What is the primary function of the oropharyngeal membrane during embryonic development?

    <p>Separating the oropharyngeal region from the amniotic cavity</p> Signup and view all the answers

    Which of the following statements about neurulation is correct?

    <p>It is the process of forming the neural tube from the embryonic disc.</p> Signup and view all the answers

    Which of the following structures is NOT involved in the formation or development of the notochord?

    <p>Yolk sac</p> Signup and view all the answers

    Study Notes

    Week 2 of Development

    • The second week of development is characterized by the formation of a two-layered germinal disc consisting of epiblast and hypoblast.
    • Two membranes, the yolk sac and amnion, develop on either side of the bilaminar germinal disc.
    • The placenta develops from two components that merge: the chorion and the functional layer of the endometrium of the uterus.

    Development of Trophoblast

    • The trophoblast develops into two layers around 8 days after fertilization.
    • The amnion is a thin membrane that encloses the entire embryo in a fluid-filled sac called the amniotic cavity, protecting the embryo from desiccation.
    • The amniotic membrane secretes amniotic fluid that bathes the embryo.

    Development of Bilaminar Embryonic Disc

    • The chorion is the outermost extraembryonic membrane formed from cytotrophoblast cells and syncytiotrophoblast.
    • The chorion blends with the functional layer of the endometrium to form the placenta, the site of exchange between the embryo and the mother.

    Week 3 of Development

    • The third embryonic week marks the beginning of a 6-week period of rapid development and differentiation.
    • During this week, the three primary germ layers are established, laying the groundwork for organ development in weeks 4-8.

    Processes of Week 3

    • Gastrulation
    • Notochord formation
    • Neural tube development
    • Somite formation
    • Intraembryonic coelom
    • Primitive cardiovascular system
    • Blood and blood vessel formation

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    Description

    Test your knowledge on the developmental anatomy of human beings, focusing on weeks 2 and 3 of development. Explore topics such as embryonic periods, germinal discs, embryoblast, and trophoblast layers.

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