Anatomy
·Thorax & Spine
Azygos System & Thoracic Veins
⭐ PREMIUM
The azygos system drains the thoracic wall and links the SVC to the IVC — a key collateral pathway.
THE SYSTEM
• Azygos vein (right): ascends on the right of the vertebral bodies, arches over the right lung hilum → SVC at the sternal angle.
• Hemiazygos + accessory hemiazygos (left): cross the midline to join the azygos.
• Receive posterior intercostal, bronchial, oesophageal and mediastinal ve…
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