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Divisions of the mediastinum
| Major contents of thoracic cavity | ||
| Superior mediastinum | • Thymus | |
| Inferior mediastinum | Anterior | • Thymus |
| Middle | • Heart • Phrenic nerve • Roots of great vessels | |
| Posterior | • Thoracic aorta • Thoracic duct • Esophagus • Vagus nerve • Azygos vein • Hemi azygos vein | |

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