Editing Liver (section)

== '''Embryology''' ==

* Common progenitor cell with     biliary tree and pancreas
* Liver primordium begins to     form in week 3, as an outgrowth of endodermal epithelium at the distal end     of the foregut - 'hepatic diverticulum' or 'liver bud'
** The connection between the      hepatic diverticulum and foregut persists, albeit narrowed, as the bile      duct
* Hepatic cells develop cords     and intermingle with the vitelline and umbilical veins to form hepatic     sinusoids
* Mesoderm of  the septum transversum connects the     liver to the ventral abdominal wall and foregut, and eventually form the     falciform ligament and lesser omentum
* Some mesoderm differentiates     into visceral peritoneum on the surface of the liver
* In the fetal circulation, the     vitelline veins carry blood from the yolk sac to the sinus venosus and     ultimately form a network of veins around the foregut that drain into the     developing hepatic sinusoids. These vitelline veins eventually fuse to     form the PV, SMV and splenic veins. The sinus venosus eventually becomes     the hepatic veins and retrohepatic IVC. The paired umbilical veins carry     oxygenated blood to the fetus, initially draining into the sinus venosus,     but from week 5 onwards, they begin to drain into the hepatic sinusoids.     The right umbilical vein ultimately disappears, and the left umbilical     vein later drains via the ductus venosus into the hepatocardiac channel,     which will later become the retrohepatic IVC.
* Bile is first formed in week     12, and can enter the GIT
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