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Embryology: Preimplantation and Implantation Stages

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Embryology: Preimplantation and Implantation Stages

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Questions and Answers

What is the first stage after fertilization where a blastocyst forms?

Lacunae formation

Implantation

Trophoblast proliferation

Cleavage (correct)

During implantation, what is the role of syncytiotrophoblast?

Forms the inner mononucleated cytotrophoblast layer

Differentiates into syncytiotrophoblasts

Secretes proteolytic enzymes for invasion (correct)

Allows blastocyst to embed in the endometrium

What type of cells form the outer layer during implantation?

Glands

Maternal blood vessels

Syncytiotrophoblasts (correct)

Cytotrophoblasts

Which structure becomes filled with maternal blood during the post-implantation stage?

Lacunae Signup and view all the answers

What happens to cytotrophoblasts during implantation?

They differentiate into syncytiotrophoblasts Signup and view all the answers

Which stage marks the beginning of placental development during pregnancy?

Implantation Signup and view all the answers

What type of villi are formed when extraembryonic mesoderm enters the projections formed by cytotrophoblasts in the third week of development?

Secondary chorionic villi Signup and view all the answers

What is the role of extravillous invading trophoblasts in placental development?

Remodeling smooth muscle around maternal spiral arteries Signup and view all the answers

In fetal circulation, what is the role of maternal veins?

Supplying oxygen to the fetus Signup and view all the answers

What is the main function of placental circulation in relation to oxygen and nutrients?

Transporting oxygen and nutrients to the fetus Signup and view all the answers

How do extraviilous invading trophoblasts contribute to maternal blood flow into the intervillous space?

Invade and remodel maternal spiral arteries Signup and view all the answers

What is a potential consequence of inadequate trophoblast invasion of spiral arteries during pregnancy?

Onset of preeclampsia Signup and view all the answers