Embryology of the GI Flashcards
Part of which embryological structure becomes the gut tube?
Yolk sac
During which weeks does organogenesis take place?
Weeks 3-8
What constitutes the foregut?
Oesophagus
Stomach
Duodenum at the entrance of the bile duct
Pancreas, liver and gallbladder also form in the foregut
What is the beginning and end of the midgut?
Duodenum after entrance of bile duct Jejunum Ileum Caecum Proximal 2/3 colon
What constitutes the hindgut?
Distal 1/3 of the colon Splenic flexture Descending colon Sigmoid colon Rectum
Which structures are formed from the lateral plate mesoderm?
Visceral and parietal layers of the peritoneum
What name is given to the area behind the stomach?
Omental bursa
Lesser sac
What other name is given to the abdominal cavity (in front of stomach)?
Greater sac
Through which structure do the greater and lesser sac communicate?
Epiploic foramen
What ligament carries the umbilical vein?
Falciform ligament
What 2 things must happen for the midgut to reach adult pattern?
Rotation
Herniation
When does herniation of the midgut occur?
Week 6
What is Meckel’s diverticulum?
A bulge protruding from the umbilical cord occuring when the vitelline duct is not fully absorbed by the fetus in the 7th week of pregnancy
Which artery supplies the foregut?
Coeliac artery
Which artery supplies the midgut?
Superior mesenteric artery