Placental Development EC

Question 1

Inner layer of chorionic villi. Makes cells.

Answer 1

Cytoprophoblast

Question 2

Outer layer of chorionic villi; secretes hCG and HPL

Answer 2

Syncytioprophoblast

Question 3

hCG action

Answer 3

similar to LH

Stimulates corpus luteum to secrete progesterone

Question 4

Fetal component of placenta

Answer 4

Syncytiotrophoblast and Cytotrophoblast

Question 5

Maternal component of placenta

Answer 5

Decidua basalis

Derived from endometrium
Maternal blood in lacunae

Question 6

Gives rise to umbilical arteries (2) and vein (1)

Answer 6

Allantois

Question 7

Duct between bladder and yolk sac

Becomes medial umbilical ligament in adults

Answer 7

Urachus

Yolk sac–> Allantois–> Urachus

Question 8

Urine discharge from umbilicus

Answer 8

Patent urachus

Question 9

Outpouching of bladder

Answer 9

Vesicourachal diverticulum

Question 10

Connects yolk sac to midgut lumen

Answer 10

Vitelline duct (omphalo-mesenteric duct)

usually obliterated in 7th week

Question 11

Meconium discharge from umbilicus

Answer 11

Vitelline fistula

Question 12

Partial closure of vitelline duct with patent portion attached to ileum. May have ectopic gastric mucosa –> Melena, periumbilical pain, and ulcer

Answer 12

Meckel’s diverticulum