Segments of inferior vena cava

The inferior vena cava is divided into four segments: intrahepatic, suprarenal, renal, and infrarenal. Each segment arises from different embryonic structures, contributing to the complexity of its development and potential for congenital anomalies.

1. Intrahepatic segment (Intrahepatic part of inferior vena cava): This segment runs through the liver and is closely associated with the hepatic veins.

2. Suprarenal segment (Suprarenal part of inferior vena cava): Located above the renal veins, this segment is in proximity to the adrenal glands.

3. Renal segment (Interrenal part of inferior vena cava): This segment includes the portion of the IVC that receives the renal veins.

4. Infrarenal segment (Infrarenal part of inferior vena cava): This segment extends from below the renal veins to the point where the IVC bifurcates into the common iliac veins.

Some sources describe a thoracic segment (thoracic part of inferior cava), as a fifth segment, that is the small portion located between the hepatic veins and the right atrium.