Placenta

Question 1

What vitamins cross the placenta barrier readily?

Answer 1

Vitamins B, C, D

Question 2

What process is used for the transfer of antibodies?

Answer 2

Pinocytosis

Question 3

What changes are seen in the placenta in late pregnancy?

Answer 3

• no cytotrophoblasts visible
• More fetal capillaries seen
• harder to distinguish between fetal and maternal cells

Question 4

What week does the placenta start to form?

Answer 4

Week 1

Question 5

When does the teriatrary villi start forming?

Answer 5

End of week 3

Question 6

What day does the fetus start using nutrients from the mother?

Answer 6

Day 12

Question 7

What is the tissue of the decidua that covers the fetus that is not involved in the placenta?

Answer 7

Decidua capsularis

Question 8

What is the tissue surrounding the rest of the womb that doesn’t come into contact with the placenta or fetus?

Answer 8

Decidua Parietalis

Question 9

What is the function on the amnion?

Answer 9

Provide physical protection

Question 10

What layers make up the placenta barrier?

Answer 10

4 layers:

• Fetal capillary endothelium
• connective tissue of villi
• cytotrophoblasts
• syncytiotrophoblasts

Question 11

What happens to the barrier as pregnancy progresses?

Answer 11

There is loss of the cytotrophoblasts and increased blurring of the maternal and fetal aspects of the placenta

Question 12

What is found in the umbilical vein?

Answer 12

Wharton’s Jelly

Umbilical artery

Umbilical vein

Allantoic duct