NEET PG Medical – 2015 – Question – 34
Azygous vein drains into:
a) Right subcostal vein
b) Superior vena cava
c) Braciocephalic
d) Right ascending lumbar vein
Correct Answer – B
The origin of the azygos vein is variable. It is often formed by the union of the right ascending lumbar vein and the right subcostal vein.
It ascends through the aortic opening in the diaphragm on the right side of the aorta to the level of the fifth thoracic vertebra.
Here it arches forward above the root of the right lung to empty into the posterior surface of the superior vena cava. The azygos vein has numerous tributaries, including the fifth to eleventh right posterior intercostal veins, the right superior intercostal vein, the hemiazygos and the accessory hemiazygos veins, and numerous esophageal, mediastinal and pericardial veins.
