- Two veins
- Lie longitudinally on the left side of the bodies of the Thoracic Vertebrae
- Communicate with each other
- BUT characteristically drain separately from their adjoining ends behind the Oesophagus into the Azygos Vein
- Receive blood from:
- Lower 8 Posterior Intercostal Vein of the Left Side (4 each)
- Inferior vein, a.k.a. Hemiazygos Vein, formed in the abdomen by the union of the Left Ascending Lumbar Vein and the Left Subcostal Vein
- Often communicates with the Left Renal Vein
- Passes up through the Left Crus of the Diaphragm
- Receives blood from the lower Oesophagus
- Superior vein, a.k.a. Accessory Hemiazygos Vein, receives Bronchial veins from the Left Lung
