Peritoneal cavity and mesenteries

Epiploic Foramen of Winslow

An opening into omental bursa (Figures III-3-10 and III-3-11).

A finger in the epiploic foramen that presses:

• Anteriorly—touches hepatoduodenal ligament and the portal vein ■ Posteriorly—touches inferior vena cava

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The liver is divided into two lobes of unequal size by the falciform ligament.

■ Fissures for the ligamentum teres and the ligamentum venosum, the porta hepatis, and the fossa for the gallbladder further subdivide the right lobe into the right lobe proper, the quadrate lobe, and the caudate lobe.

■ The quadrate and caudate lobes are anatomically part of the right lobe but functionally part of the left. They receive their blood supply from the left branches of the portal vein and hepatic artery and secrete bile to the left hepatic duct.

The liver has a central hilus, or porta hepatis, which receives venous blood from the portal vein and arterial blood from the hepatic artery.

• The central hilus also transmits the common bile duct, which collects bile produced by the liver.

■ These structures, known collectively as the portal triad, are located in the hepatoduodenal ligament, which is the right free border of the lesser omentum.

The hepatic veins drain the liver by collecting blood from the liver sinusoids and returning it to the inferior vena cava.

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