L10 - Anatomy of the Liver and Biliary System Flashcards
What creates the 4 anatomical lobes of the liver?
Anterior side - falciform lig. splits left and right lobe.
Posterior side - caudate (created by IVC impression) and quadrate (gall bladder impression) above and below the porta hepatis respectively
What does the falciform ligament split into?
Falciform lig. splits into left and right triangular lig.
Left triangular lig forms the lesser omentum (posterior side of liver).
Right triangular lig wraps around the posterior side and becomes the right coronary - encompasses porta hepatis.
What are the 8 functional segments fo the liver defined by?
Portal triads:
- Hepatic artery
- Portal vein
- Bile duct
What are the special types of capillaries found in the liver, and how do they function?
Sinusoidal capillaries - vascular channels between hepatocytes.
Allow all hepatocytes to be in contact with blood, allowing transfer of many products.
Hexagonal lobules in the liver have 2 inputs and 2 outputs. What are they?
Inputs: Hepatic artery and portal vein.
Outputs: Central vein and bile duct.
What special feature in the liver reflects the union of the porto-caval systems?
Hexagonal lobules.
Describe the concept of blood and bile movements in the lobule.
BLood and bile move in opposite directions.
Blood (portal venous and hepatic arterial) : Triad → Central vein
Bile (Hepatocytes): CV → Triad (bile duct)
Where are triads and the central veins located in hexagonal lobules?
What is the biliary system derived from?
An outpouching of the foregut - derived from the hepatic diverticulum
Name the ducts that lead to and from the gall bladder.
Describe the histology of the gall bladder
No mucous cells.
No muscularis mucosa or submucosa.
Simple columnar epithelium for water reabsorption to concentrate bile.
