Placenta Embryo

Question 1

Monozygotic Twins that separate 0-4days (~25%)

Answer 1

Either fused or separate placenta; both dichorionic diamniotic

Question 2

Monozygotic Twins that separate 4-8days (~75%)

Answer 2

After morula stage; monochorionic diamniotic

Question 3

Monozygotic Twins that separate 8-12days (

Answer 3

After blastocyst stage; monochorionic monoamniotic

Question 4

Monozygotic Twins that separate >13 days

Answer 4

Monochorionic monoamniotic conjoined twins

Question 5

Dizygotic twins

Answer 5

2 eggs, two sperm; more common than monozygotic

Question 6

Primary site of nutrient and gas exchange between mother and fetus

Answer 6

Placenta

Question 7

Inner layer of chorionic villi

Answer 7

Cytotrophoblast

Question 8

Outer layer of chorionic villi; secretes hCG

Answer 8

Syncytiotrophoblast

Question 9

hCG is structurally simmilar to what hormone

Answer 9

LH

Question 10

Stimulates corpus luteum to secrete progesterone during first trimester

Answer 10

Syncytiotrophoblast

Question 11

Derived from endometrium, maternal blood in lacunae

Answer 11

Decidua basalis

Question 12

Normal components of umbilical cord

Answer 12

2 umbilical arteries, 1 umbilical vein, allantoic duct, Wharton jelly

Question 13

Umbilical arteries and vein derivation

Answer 13

Allantois

Question 14

Single umbilical Artery

Answer 14

congenital and chromosomal anomalies

Question 15

Return deoxygenated blood from fetal internal iliac arteries to placenta

Answer 15

Umbilical arteries (2)

Question 16

Supplies oxygenated blood from placenta to fetus; drains into IVC via liver or ductus venosus

Answer 16

Umbilical Vein

Question 17

Duct between fetal bladder and yolk sac

Answer 17

Urachus (which is from allantois)

Question 18

Urine discharge from belly button

Answer 18

Patent urachus

Question 19

Partial failure of urachus to obliterate; fluid filled cavity lined with uroepithelium, between umbilicus and bladder.

Answer 19

Urachal cyst (can lead to infectio of adenocarcinoma)

Question 20

outpouching of bladder

Answer 20

vesicourachal diverticulum

Question 21

Time when vitelline duct is obliterated

Answer 21

7th week

Question 22

Connects yolk sac to midgut lumen

Answer 22

Vitelline duct

Question 23

Meconium discharge from umbilicus

Answer 23

Vitelline fistula

Question 24

Partial closure of vitelline duct; atent part attached to ileum.

Answer 24

Meckel diverticulum

Question 25

2 Tissue types associated with Meckel diverticulum

Answer 25

Ectopic gastric mucosa and or pancreatic tissue