Embryology Quiz

Question 1

Massive rectal bleeding in infant. From bright to dark red. Fee of pain. Meckel’s diverticulum dx. Condition

Answer 1

Remnant of vitelline duct

Question 2

Hirshprung’s

Answer 2

Failure of neural crest cells to migrate to distal colon to form ganglia
Affected colon can’t undergo peristalsis - constriction

Question 3

Double bubble sign?

Answer 3

Duodenal atresia

Question 4

GI tract structures undergo rotation except:

a. stomach
b. duodenum
c. ventral pancreas
d. midgut
e. hindgut

Answer 4

Hindgut

-initially forms from the cloacal space

Question 5

Gastroschisis

Answer 5

NOT covered by peritoneum like omphalocele

Question 6

Baby vomitting now projectile. 30 minutes after feeding. Olive sized mass on RUQ, bile not green. Dx?

Answer 6

Hypertrophic pyloric stenosis

Question 7

Caudal part of midgut loop forms many intestine structures except

Answer 7

Vitelline duct

-

Question 8

2 parts of lateral plate mesoderm?

Answer 8

Somatic, splanchnic

Question 9

Meckel’s diverticulum is a congenital connection from the umbilicus via a vitelline ligament to the _______. 2% population, 2 in, 2x in males, 2 yo.

Answer 9

Ileum

AKA ileal diverticulum

Question 10

Organ covered on one surface with peritoneum and is immobile. What is it?

Answer 10

Retroperitoneal

Question 11

Ascend and descend colon had a mesentery, but became organs not covered on all sides by peritoneum. Classify as?

Answer 11

Secondary retroperitoneal

Question 12

Lining of peritoneal cavity is derived from ______ while lining of gut tube from ___________

Answer 12

Somatic mesoderm

Endoderm (from yolk sac)