4G. Embryology - Foregut Flashcards
what is the embryological layer that made the endothelium linig of the digestive tract and parenchyma of glands (e.g. hepatocytes)
endoderm
what embryonical layer made the connective tissue for glands, muscle and peritoneal components of the gut wall
visceral mesoderm
what day does body folding commence
day 22 - formation of the gut
dorsal mesentery is made from what
visceral mesoderm
what is the gut split into
foregut, midgut, hindgut
superior mesenteric artery belongs to …?
midgut
inferior mesenteric gut tube belongs to…?
hindgut
what does the mesentery do
connects the gut tube to the back wall for your stomach at 5 weeks old (this is the dorsal mesentery)
where does the ventral mesentry come from
the septum transversum
when your liver starts to grow it splits your ventral mesentery in two. name the 2
ventral mesogastrium
falciform ligament
what does the ventral mesogastrium turn into
lesser omentum
what does the falciform ligament do
attaches liver to ventral body wall
when does the oesophagus lengthen
when the heart and lungs develop and move downwards
when does the lung bud appear as an outgrowth from the ventral foregut
week 4
when does the stomach form
week 4
what does the stomach start as
a fusiform dilation
which wall forms the lesser and greater curvature of the stomach
ventral wall - lesser
dorsal wall - greater
bc the dorsal wall is faster
what are the longitudinal mesentery changes with stomach rotation
moves the dorsal mesogastrium to the left creating the omental bursa
pulls lesser omentum to the right
what is the omental bursa
space behind the stomach
what are the anteroposterior mesentery changes with stomach rotation
the dorsal mesogastrium bulges down and grows further to form the greater omentum
Where is the duodenum
foregut and midgut
as the stomach rotates where does the duodenum move to
to the right side of the abdominal cavity
which parts of the duodenum become retroperitoneal
parts 2 and 3 (attached to the body wall)
liver bud appears when?
week 4
where does the liver bud penetrate
septum transversum
the connection between the liver bud and the foregut narrows to create what
bile duct
a ventral outgrowth from the bile duct forms what two things
gall bladder and cystic duct
what is hepatic sinusoids made from
liver cords, vitelline and umbilical veins
liver cords differentiate into what
liver cells (parechyma) and lining of bilary ducts (endoderm derived)
The liver is the principal blood-forming organ of the fetus between the which months of gestation.
2nd and 7th
when do hepatic cells start to form bile
12th week
the septum transversum contributes ……what cells
hematopoietic, Kupffer and connective tissue cells (mesoderm derived)
what are the 2 buds formed off the endodermal lining of the duodenum
ventral pancreatic bud and dorsal pancreatic bud
what does the ventral pancreatic bud do
forms the uncinate process and inferior part of the head
what does the dorsal pancreatic bud do
forms the rest of the pancreas
Duodenum rotation moves the which pancreatic bud below the which.
ventral below dorsal pancreatic bud
what is an annular pancreas
abnormality where the ventral pancreatic bud encircles the duodenum and leads to constriction/occlusion
when does the spleen appear in the dorsal mesogastrium
4th week
when does the structure actually differentiate into the spleen
5th week
what is the spleen derived from
mesoderm
where is the spleen
left side
