|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 anterior mediastinum exists only on the left side where the left pleura diverges from the mid-sternal line.
It is narrow, above, but widens out a little below.
It is bounded:
- Laterally by the pleurae
- Posteriorly by the pericardium
- Anteriorly by the sternum, the left transversus thoracis and the fifth, sixth, and seventh left costal cartilages
- A quantity of loose areolar tissue
- Dome lymphatic vessels which ascend from the convex surface of the liver
- Two or three anterior mediastinal lymph nodes
- The small mediastinal branches of the internal thoracic artery
- Thymus (involuted in adults)
See also 
- thoraxlesson4 at The Anatomy Lesson by Wesley Norman (Georgetown University) - "Anterior Mediastinum"
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