Azygos vein

The azygos vein ( v. ancient Greek. Ἄζυγος, unbound ') in humans is a venous blood vessel, which lies on the inside hull to the right of the spine. My left side counterpart is the hemiazygos vein, which opens at the level of the 7th or 8th thoracic vertebra in the azygos vein.

The vein arises after the passage through the aortic hiatus of the diaphragm from the right Lendenvene ( Vena ascending lumbar vein, which is connected via collaterals to both the inferior vena cava, and the iliac artery in combination ) and ends at the level of the third rib in the superior vena cava ( superior vena cava ). Since it has cross- connections to the inferior vena cava, it represents a potential collateral circulation between upper and lower vena cava in liver diseases such as cirrhosis of the liver is ( portocaval anastomosis, portal hypertension ), as well as thrombosis of the vena cava or its plant -related absence. From the chest cavity receives venous blood from the: venae intercostal ( intercostal veins), venae oesophageae ( esophagus ), venae phrenic the superior (upper part of the diaphragm ), venae bronchial (bronchi ), venae pericardiales ( pericardium ), venae mediastinal ( mediastinum ) and the vena intervertebralis (range spinal cord).

Through the azygos lobe can be a during organogenesis of the lung venae azygos develop.

Azygos vein in animals

The people, the azygos vein is similar in horses and predators. Here she is because of course referred to the right of the aorta than vena azygos vein. It collects the blood of the intercostal veins and empties into the anterior vena cava ( vena cava cranial ).

In the even-toed ungulates the corresponding vessel runs on the left side as azygos vein. This opens into the coronary sinus.