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Inferior vena cava
The inferior vena cava (or IVC) ((ラテン語:vena, ''vein'', cavus, ''hollow'' )), is one of the venae cavae, two large veins, that carries deoxygenated blood from the body into the right atrium of the heart. The inferior vena cava carries blood from the lower half of the body whilst the superior vena cava carries blood from the upper half of the body. It is formed by the joining of the right and the left common iliac veins, usually at the level of the fifth lumbar vertebra.
It is a large retroperitoneal vein that lies posterior to the abdominal cavity and runs along the right side of the vertebral column. It enters the right atrium at the lower right, back side of the heart.
==Structure==
The inferior vena cava is formed by the joining of the left and right common iliac veins and brings collected blood into the right atrium of the heart. It also joins with the azygos vein (which runs on the right side of the vertebral column) and venous plexuses next to the spinal cord.
The inferior vena cava begins as the left and right common iliac veins behind the abdomen join, at about the level of L5. It passes through the thoracic diaphragm at the caval opening at the level of T8.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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