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Embryonic Development: Decidual Zones and Cavities

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Embryonic Development: Decidual Zones and Cavities

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Questions and Answers

What was the main reason for the enlargement of the mesometrial decidua?

Formation of the ectoplacental cleft

Decreased vascularity and proliferation of decidual cells

Increased vascularity and proliferation of decidual cells (correct)

Disruption of the maternal-embryonic interface

What happened to the primary decidual zone cells at this stage?

Most of them disappeared (correct)

They formed the decidual capsular zone

They were still present in the compact zone

They started to proliferate

How many separate cavities does the embryo have at this stage?

Three (correct)

Four

Two

One

What is the name of the zone that becomes well-defined by the progressive development of the lateral sinusoids?

Compact zone Signup and view all the answers

What is the effect of RA on the formation of blood sinusoids in the implantation site?

It inhibits the formation of blood sinusoids Signup and view all the answers

What is the consequence of RA treatment on the embryos?

They exhibit growth retardation and defective development Signup and view all the answers

What is the morphology of the implantation site in the RA-treated group?

Circular in transverse section and smaller than in control Signup and view all the answers

What cavities fail to form in the RA-treated group?

Only the exocoelom and ectoplacental cavities Signup and view all the answers

What is the unit of measurement for the scale bar in figure A&B?

Micrometer (μm) Signup and view all the answers

At what stage of development were the observations made?

GD 7.5 Signup and view all the answers