Azygous venous system


Union of left ascending lumbar and right sub costal veins


  • Azygous vein
  • Hemiazygous veins
  • Accessory hemiazygous veins.

Tributaries and territory of drainage

  • The intercostal veins on the right drain into the azygous vein; while those on the left drain into the hemiazygous and accessory hemiazygous.
  • Drains thoracic and abdominal walls
  • Connects superior and inferior vena cava


  • It joins the superior vena cava at the level of the sternal angle.

Home | Project Anatomy | Gross Anatomy | Topic Index | Chapter 30

Posterior Mediastinum and posterior chest wall