Behind the thoracic aorta is the vertebral column and the hemiazygos vein.
2.
The structure of the hemiazygos vein is often variable.
3.
A major tributary is the hemiazygos vein, a similar structure on the opposite side of the vertebral column.
4.
The esophagus also lies in front of parts of the hemiazygos veins and the intercostal veins on the right side.
5.
It receives the posterior intercostal veins from the 4th, 5th, 6th, and 7th intercostal spaces between the left superior intercostal vein and highest tributary of the hemiazygos vein; the left bronchial vein sometimes opens into it.
6.
The left aortic intercostals run backward on the sides of the vertebrae and are covered by the left lung and pleura; the upper two vessels are crossed by the left superior intercostal vein, the lower vessels by the hemiazygos vein.
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