Week 2: Formation of the Bilaminar Embryo

Question 1

Role of the human chorionic gonatropin? What suggest low and high levels of it?

Answer 1

• stimulates progesterone production by corpus luteum
• ⬇️ may predict spontaneous abortion or ectopic pregnancy
• ⬆️ may predict multiple pregnancy, hydatidiform mole, gestational trophoblastic disease

Question 2

Where does the hematopoiesis first occur?

Answer 2

• mesoderm surrounding the yolk sac (up to 6 weeks), later fetal liver, spleen, thymus (6 weeks to third trimester) and bone marrow

Question 3

When embryoblast rises the epiblast and hypoblast, they are separated, except in one region, what structure is formed?

Answer 3

Prechordal plate: future mouth, establish the polarity.

Question 4

Which forms the amniotic cavity?

Answer 4

Epiblast