Fetal Circulation

Question 1

What does the umbilical vein split into?

Answer 1

Left portal vein and ductus venosus

Question 2

What is the ductus venosus?

Answer 2

first fetal shunt, bypasses liver, regulates umbilical venous blood flow

Question 3

What is the foramen ovale?

Answer 3

2nd fetal shunt, bypasses right side of heart and lungs, blood goes straight into left atrium

Question 4

What is the crista dividens?

Answer 4

tissue barrier in RA, helps direct portion of blood away from FO towards RV

Question 5

What is the ductus arteriosus?

Answer 5

3rd fetal shunt, dumps blood directly into aorta, bypasses lungs

Question 6

Where do the umbilical arteries originate from?

Answer 6

internal iliac arteries

Question 7

What do the umbilical arteries become?

Answer 7

umbilical ligaments, prox segments of superior vesicle arteries

Question 8

Where is the ductus arteriosus located?

Answer 8

aortic isthmus

Question 9

What is the ductus arteriosus renamed after birth?

Answer 9

ligamentum arteriosus

Question 10

What is it called if the ductus arteriosus remains open after birth?

Answer 10

Patent ductus arteriosus (PDA)

Question 11

What is the foramen ovale renamed after birth?

Answer 11

fossa ovalis

Question 12

What is it called if the foramen ovale remains open after birth?

Answer 12

atrial septal defect (ASD)

Question 13

What does the umbilical vein become after birth?

Answer 13

ligamentum teres

Question 14

What does the ductus venosum become after birth?

Answer 14

ligamentum venosum (seen on U/S)