GI Section III: LIVER / BILIARY Flashcards
The liver is covered by visceral peritoneum except at the?
Porta hepatis, bare area and gallbladder fossa.
Bare area injury =
Retroperitoneal bleed
What divides segments 7/8 and 5/6
Right hepatic vein
What divides 4a/8 and 4b/5
Middle hepatic vein
What divides 4a/2 and 4b/3
Left hepatic vein/Ligamentum teres (falciform)
What divides the upper and lower segments
Portal vein
Where does segment 1 drain?
Directly to IVC
divides the liver into a functional left and right hepatic lobes.
“Cantlie’s Line”
Where does Cantlie’s line run?
This line runs from the IVC to the middle of the gallbladder fossa.
The caudate lobe (segment 1) has a direct connection to the IVC through?
Its own hepatic veins
NO COMMINUCATION with the primary hepatic vein
What other vessels does the caudate lobe gets its supply?
Why does it matter?
Branches of the right and left portal veins
because the caudate may be spared or hypertrophied as the result of various pathologies such as Budd Chiari..etc
why it is the right portal vein more susceptible to fibrosis?
the intra-hepatic course of the right portal vein is longer than the left
this is why the right liver shrinks, and the left liver grows in cirrhotic morphology
Most common vascular variant
Replaced right hepatic (origin from the SMA)
Most common biliary variant
Right posterior segmental into the left hepatic duct.
Normal MRI Signal Characteristics of the Liver, pacreas and spleen
Spleen = bag of water/blood - T2 bright T1 dark
Pancreas = Brightest T1 structure (because of enzymes)
Liver = has enzymes similar to pancreast (T1 brigth, T2 dark)
In Fetal Circulation
