vena caval foramen

FREE subscriptions for doctors and students... click here
You have 3 more open access pages.

The vena caval foramen is the diaphragmatic aperture through which the vena cava passes. It has the following characteristics:

  • in expiration, situated at the level of the lower border of T8 vertebra which approximates the 6th costal cartilage
  • the most superior of all the large diaphragmatic apertures
  • passes through the tendinous part of the diaphragm a few centrimetres anterior to the vertebral body and to the right of the median plane
  • the vena cava is firmly attached to the sides of the foramen; consequently, on contraction of the diaphragm, the aperture descends and increases in diameter. This has the effect of increasing vena caval diameter and facilitating thoracic venous return.
  • other structures that may pass through the aperture include:
    • right phrenic nerve
    • ascending lymphatics
    • infrequently, the right hepatic vein

Last reviewed 01/2018