1 — Superior vena cava; 2 — Azygos vein; 3 — Hemi-azygos vein; Inferior hemi-azygos vein; 4 — Pericardiacophrenic veins; 5 — Superior phrenic veins; 6 — Inferior phrenic veins; 7 — Inferior vena cava; 8 — Musculophrenic veins; 9 — Internal thoracic veins; 10 — Brachiocephalic vein
