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foramen venae cavae
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The Diaphragm Under surface (Vena caval foramen labeled near top center, in white region)
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Superior vena cava, inferior vena cava, azygos vein and their tributaries
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The is a hiatus in the
Diaphragm of humans through which passes the
Inferior Vena Cava , the wall of which is adherent to the margins of the opening, and some branches of the right
Phrenic Nerve .
It is located approximately at the level of the eighth
Thoracic Vertebra (T8), and passes through the diaphragm's
Central Tendon .
It is quadrilateral in form, and is placed at the junction of the right and middle leaflets of the central tendon, so that its margins are tendinous.
By being situated in the tendinous part of the diaphragm, it is stretched open every time
Inspiration occurs.
Since thoracic pressure decreases upon inspiration and draws the caval blood upwards toward the
Right Atrium , increasing the size of the opening allows more blood to return to the heart, maximizing the efficacy of lowered thoracic pressure returning blood to the
Heart .
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- - "Major Openings in the Diaphragm"
