What is vena Azygous?
Azygos vein (Vena azygos) The azygos venous system is located on either side of the vertebral column and drains the viscera within the mediastinum, as well as the back and thoracoabdominal walls. This system consists of the azygos vein and its two main tributaries: the hemiazygos vein and the accessory hemiazygos vein.
What does the hemiazygos vein do?
The hemiazygos vein helps to drain the left mediastinum and left lower esophagus. The hemiazygos vein crosses from left to right at approximately the level of T9 and terminates by emptying into the azygos vein.
Which veins are part of the Azygous system?
The azygos vein receives the lower eight right-sided posterior intercostal veins, as well as the bronchial veins from the right lung. It is joined by the right superior intercostal vein superiorly.
Where does hemiazygos vein end?
T8 vertebra
It continues its course superomedially through the posterior mediastinum, traveling on the left hand side of the thoracic spine. It then courses to the right, crossing the aorta, esophagus and thoracic duct posteriorly. This vein terminates by draining into the azygos vein at the level of the T8 vertebra.
What are azygos and hemiazygos veins?
Thus, azygos means unpaired. The azygos vein is unpaired in that there is only one in the body, mostly on the right side. While there is the hemiazygos vein and its accessory on the left side of the body, they are considered tributaries of the azygos vein rather than its left-side equivalent.
What does the accessory hemiazygos vein drain?
Anatomical terminology The accessory hemiazygos vein, also called the superior hemiazygous vein is a vein on the left side of the vertebral column that generally drains the fourth through eighth intercostal spaces on the left side of the body.
What are the functions of the Azygous the hemiazygos and the accessory hemiazygos veins?
That is, the azygos vein serves to drain most of the posterior intercostal veins on the right side of the body, and the hemiazygos vein and the accessory hemiazygos vein drain most of the posterior intercostal veins on the left side of the body.
What is accessory hemiazygos vein?
The accessory hemiazygos vein, also called the superior hemiazygous vein is a vein on the left side of the vertebral column that generally drains the fourth through eighth intercostal spaces on the left side of the body.
What is the difference between azygos and hemiazygos veins?
What vein drains into the hemiazygos vein?
The azygos vein drains into the superior vena cava. At approximately T8–T9 the hemiazygos veins join the azygos vein usually posterior to the aorta.
Where does the hemiazygos vein join the azygos vein?
Accessory hemiazygos vein: Draining the superior left hemithorax as well as veins of the esophagus, the accessory hemiazygos vein descends to the left of the spinal column. It crosses over to join the azygos vein, or sometimes the hemiazygos vein, at the seventh vertebra.
What does the accessory hemiazygos vein drain into?
The accessory hemiazygos vein is formed by the confluence of the middle left posterior intercostal veins. It descends to the left of midline, adjacent to the thoracic vertebrae and crosses posteriorly to the aorta at the level of T7-8 to drain into the azygos vein.