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Third Week of Development: Trilaminar Germ Disc Quiz

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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?

Approximately 5 weeks after conception 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?

Amniotic cavity Signup and view all the answers

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

Gastrulation Signup and view all the answers

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

Primitive node Signup and view all the answers

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

Invagination Signup and view all the answers

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

Fibroblast Growth Factor (FGF8) Signup and view all the answers

What does the embryonic ectoderm give rise to?

Epidermis, nervous systems, and neural crest cells Signup and view all the answers

What does the embryonic endoderm give rise to?

Epithelial linings of respiratory and alimentary tracts, and glandular cells Signup and view all the answers

What does the embryonic mesoderm give rise to?

Skeletal muscles, blood cells, and extraembryonic mesoderm Signup and view all the answers

What covers the yolk sac and amnion?

Extraembryonic mesoderm Signup and view all the answers

Where is the prechordal plate located?

Between the tip of the notochord and the oropharyngeal membrane Signup and view all the answers

What does the oropharyngeal membrane consist of?

Tightly adherent ectoderm and endoderm cells without mesoderm Signup and view all the answers

What is the notochord derived from?

Epiblast and hypoblast Signup and view all the answers

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?

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

What does gastrulation establish in embryos?

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

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

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

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

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

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

What does the embryonic ectoderm give rise to?

What does the embryonic endoderm give rise to?

What does the embryonic mesoderm give rise to?

What covers the yolk sac and amnion?

Where is the prechordal plate located?

What does the oropharyngeal membrane consist of?

What is the notochord derived from?

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