Session 2: Early Embryogenesis

Question 1

What is the function of the hypoblast?

Answer 1

It lines the blastocyst cavity forming the yolk sac

Question 2

What is the function of the epiblast?

Answer 2

Forms 3 germ layers and forms the amniotic sac

Question 3

What is the function of the syncytiotrophoblast?

Answer 3

Role in fetal-maternal gas exchange, nutrient exchange, immunological and metabolic functions.
Facilitates implantation of blastocyst in maternal endometrium

Question 4

What is the function of the cytotrophoblast?

Answer 4

Route blood flow through the placenta for the growing embryo to use

Question 5

Why is C-section indicated in placenta praevia?

Answer 5

Baby cannot come out of the cervix without ripping the placenta due to blockage
Avoid severe bleeding during vaginal delivery.

Question 6

What is an ectopic pregnancy?

Answer 6

• Fertilized egg grows outside of the uterus
• Implantation occurs at site other than the uterine body
• Can be peritoneal or ovarian

Question 7

What is placenta privae?

Answer 7

Implantation occurs in the lower uterine segment

Question 8

Why can placenta privae cause bleeding?

Answer 8

Cervix thins and opens up causing blood vessels connecting the placenta and the uterus to become vulnerable to tearing and then bleeding

Question 9

What is the notochord and what are its functions?

Answer 9

Solid rod of mesodermal cells in the midline.