|A transverse section of the thorax, showing the contents of the middle and the posterior mediastinum. The pleural and pericardial cavities are exaggerated since normally there is no space between parietal and visceral pleura and between pericardium and heart.|
|Gray's||subject #239 1092|
The middle mediastinum is the broadest part of the interpleural space.
- the heart enclosed in the pericardium
- the ascending aorta
- the lower half of the superior vena cava with the azygos vein opening into it
- the bifurcation of the trachea and the two bronchi
- the pulmonary artery dividing into its two branches
- the right and left pulmonary veins
- the phrenic nerves
- some bronchial lymphatic glands
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