Embryology of the Gut Tube Flashcards
The GIT originates from which embryonic layer?
endoderm
during which weeks of gestation is the gut tube formed?
3rd and 4th week
what gives rise to parietal and visceral mesoderm? (later parietal and visceral peritoneum)
lateral plate mesoderm
what membrane of the foregut gives rise to the mouth?
oropharyngeal membrane
what membrane of the hindgut gives rise to anus and urogenital tract?
cloacal membrane
what connects the midgut to the umbilical vessel/yolk sac at around 4th week of development?
vitelline duct
at around the 6th week of development, the vitelline duct is obliterated and replaced with?
umbilical cord
what condition occurs when the vitelline duct doesn’t obliterate?
Meckel’s diverticulum > outpouching of small intestine.
at which week of gestation does natural herniation of the midgut through the umbilical cord occur?
6th week
by which week of gestation is the intestinal loop pulled back into the abdominal cavity (reversal of natural herniation)?
10th/11th week
what condition occurs if the natural herniation of the intestinal loop is not drawn back into the abdominal cavity?
omphalocele
what gives rise to parietal peritoneum?
somatic layer of lateral plate mesoderm
what gives rise to visceral peritoneum?
splanchnic layer of lateral plate mesoderm
what anchors retroperitoneal organs to the posterior abdominal wall?
adventitia > fibrous irregular connective tissue
what gives rise to the lesser omentum?
ventral mesogastrium
