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- central portion of thorax, lies between the two lungs
- superior
- superior to heart
- superior to plane of Louis (through manubriosternal joint - body of
4th thoracic vertebra)
- contains
- great vessels which lie behind manubrium sterni,
- the vagus
- left recurrent laryngeal,
- phrenic nerves;
- sympathetic trunks;
- trachea
- oesophagus and related vessels
- thoracic duct
- remnants of thymus
- posterior
- behind heart
- contains
- oesophagus,
- thoracic duct,
- superior and inferior hemiazygos veins,
- descending aorta and branches,
- vagus nerves
- middle
- contains
- heart and pericardium,
- roots of lungs,
- part of phrenic nerves
- anterior
- in front of pericardium
- contains
- internal thoracic vessels,
- lymph glands,
- thymus
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