1 — Inferior vena cava; 2 — Aortic hiatus; 3 — Right ascending lumbar vein; 4 — Diaphragm, central tendon; 5 — Diaphragm, costal part; 6 — Posterior intercostal veins; 7 — Azygos vein; 8 — Right brachiocephalic vein; 9 — Inferior thyroid vein; 10 — Right internal thoracic vein;
11 — First rib [I]; 12 — Right subclavian vein; 13 — Right externaljugular vein; 14 — Right supreme intercostal vein; 15 — Right internal jugular vein; 16 — Left internal jugular vein; 17 — Scalenus anterior; Anterior scalene;18 — Scalenus medius; Middle scalene; 19 — Left external jugular vein; 20 — Left subclavian vein; 21 — Left internal thoracic vein; 22 — Left brachiocephalic vein; 23 — Superior vena cava; 24 — Accessory hemi-azygos vein; Superior hemi-azygos vein; 25 — Hemi-azygos vein; Inferior hemi-azygos vein; 26 — Caval opening; 27 — Oesophageal
hiatus; 28 — Left ascending lumbar vein; 29 — Lumbar veins
