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Embryonic Development: Week 2

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Questions and Answers

During the second week of embryonic development, the embryonic disc becomes bilaminar, consisting of which two layers?

Trophoblast and mesoderm

Ectoderm and endoderm

Epiblast and hypoblast (correct)

Endoderm and mesoderm

Which structures are crucial for the nourishment and protection of the developing embryo during the second week of embryonic development?

Allantois and chorion

Amniotic cavity and yolk sac (correct)

Chorion and amnion

Yolk sac and allantois

What do the amnion and yolk sac contribute to during early stages of embryonic development?

Development and support of the embryo (correct)

Exchange of gases

Formation of the placenta

Protection against infections

Which components arise from the outer layer of the developing blastocyst during the second week of embryonic development?

Syncytiotrophoblast and cytotrophoblast Signup and view all the answers

What is the function of syncytiotrophoblast and cytotrophoblast in embryonic development?

Implantation of the embryo into the uterine wall Signup and view all the answers

What is the significance of the second week of embryonic development being referred to as the 'week of 2s'?

Several key events and structures during this period exhibit a pattern or factor of two Signup and view all the answers

What is the function of the amniotic cavity and yolk sac during the second week of embryonic development?

The amniotic cavity develops above the epiblast, and the yolk sac forms below the hypoblast, providing nourishment and protection to the developing embryo Signup and view all the answers

What occurs early in the second week of embryonic development?

The embryonic disc becomes bilaminar, consisting of two layers – the epiblast and the hypoblast Signup and view all the answers

What contributes to the development and support of the embryo during early stages?

The amnion and yolk sac, both derived from the bilaminar embryonic disc Signup and view all the answers

Study Notes

Embryonic Development: Second Week

The embryonic disc becomes bilaminar, consisting of two layers: epiblast and hypoblast.
The trophoblast and chorion are crucial for the nourishment and protection of the developing embryo during the second week.

Extra-Embryonic Membranes

The amnion and yolk sac contribute to the development and support of the embryo during early stages.
The amniotic cavity and yolk sac function to nourish and protect the embryo during the second week.

Blastocyst Development

The outer layer of the developing blastocyst gives rise to the syncytiotrophoblast and cytotrophoblast.
Syncytiotrophoblast facilitates implantation, while cytotrophoblast contributes to the formation of the chorion.

Significance of the Second Week

The second week of embryonic development is referred to as the 'week of 2s' due to the formation of two layers, two cavities, and two groups of cells.

Early Events

Early in the second week of embryonic development, the embryonic disc undergoes gastrulation, and the amniotic cavity and yolk sac develop.
The trophoblast and chorion contribute to the development and support of the embryo during this stage.

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Description

Explore the key events and structures that characterize the second week of embryonic development, known as the 'week of 2s' due to several occurrences exhibiting a pattern or factor of two.