ABSTRACT
The Azj/gos Anastomosis This unites the R and L supracardinal veins, which drain most of the thoracolumbar intersegmental veins in the posterior body wall (Figure 1 ).
• The R supracardinal vein forms the adult vena azygos. Note that the cranial part of the R posterior cardinal persists as the arch of the vena azygos (Figure 1).
