lumbar vein การใช้

By contrast, all the lumbar veins and hepatic veins usually drain directly into the inferior vena cava.
It usually begins in the left ascending lumbar vein or renal vein, and passes upward through the left crus of the diaphragm to enter the thorax.
It is formed by the union of the ascending lumbar veins with the right subcostal veins at the level of the 12th thoracic vertebra, ascending in the posterior mediastinum, and arching over the right main bronchus posteriorly at the root of the right lung to join the superior vena cava.
The first and second lumbar veins usually join the ascending lumbar vein rather than the inferior vena cava, which then joins the subcostal vein of the same side to form the azygous vein on the right or hemiazygous vein on the left . The third and fourth lumbar veins on the left pass behind the abdominal aorta to reach the inferior vena cava and " all " lie behind the sympathetic trunks.
The first and second lumbar veins usually join the ascending lumbar vein rather than the inferior vena cava, which then joins the subcostal vein of the same side to form the azygous vein on the right or hemiazygous vein on the left . The third and fourth lumbar veins on the left pass behind the abdominal aorta to reach the inferior vena cava and " all " lie behind the sympathetic trunks.