liver Flashcards
liver anatomy: describe the gross, structural and functional organisation of the liver
what separates the left and right lobes of liver
falciform ligament
what are the two main perfusing vessels
hepatic artery from heart, hepatic portal vein from gut
separation of lobes
discrete segments with anatomical borders, independent blood supply, bile drainage
significance of lobe separation
able to have severe damage in one part without affecting other parts
subsection numbers
I-VIII, with IV split into upper (a) and lower (b) subsegments
drainage of liver
subsection drains into own vein, then into left, middle or right hepatic veins, before joining vena cava
what is a hepatic lobule
structural unit, roughly hexagonal, with each corner consisting of a portal triad linking with 3 adjacent lobules
what are the 3 conduit vessels/ducts in the portal triad
branch of hepatic portal vein, branch of hepatic artery, bile duct (from bile canaliculi)
in the lobule, which direction does blood flow
towards centre
in the lobule, which direction does bile flow
towards perimeter
what is at the centre of the liver lobule, and its function
central vein which collects blood draining from hepatic sinusoids
what is present in the lobule
rows of hepatocytes
two sides of hepatocytes
sinusois-facing, canaliculi-facing
what is a hepatic acinus
functional unit of liver tissue
what does a hepatic acinus consist of
2 adjacent 1/6 lobules that share 2 portal triads and extend as far into lobule as central veins
