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What levels does the aortic arch begin and end?
Sternal angle --> T4
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Components on L of aorta
- 1. L phrenic n.
- 2. L vagus/L recurrent pharyngeal n.
- 3. L superior intercostal v.
- 4. cardiac nn.
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Components on R of aorta
- 1. L recurrent pharyngeal n.
- 2. bifurcation of trachea
- 3. thoracic duct
- 4. esophagus
- 5. SVC
- 6. cardiac plexus
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Branches of aortic arch
- 1. Brachiocephalic
- 2. L common carotid
- 3. L subclavian
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Contents of superior mediastinum
- 1. arch of aorta + its 3 branches
- 2. ligamentum arteriosum
- 3. phrenic nn. (R is along venous plane // L is along arterial plane)
- 4. vagus nn. + L laryngeal n.
- 5. sympathetic chain
- 6. trachea
- 7. esophagus
- 8. thoracic duct
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Relations to esophagus
- Anterior: trachea, pericardium
- (L): recurrent laryngeal n.
- Posterior: vertebral column, vv.
- Laterally: lungs, aorta on (L)
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Boundaries of posterior mediastinum
- Posterior: vertebral column
- Anterior: pericardial sac
- Superior: sternal angle/T4
- Inferior: diaphragm
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Contents of posterior mediastinum
- 1. Esophagus
- 2. Vagus n.
- 3. Thoracic aorta
- 4. Thoracic duct
- 5. Azygous system
- 6. Sympathetic chain -- rami communicantes + splanchnic nn.
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Blood supply to esophagus
- 1. Inferior thyroid aa.
- 2. Esophageal branches of aorta
- 3. Superior and inferior phrenic aa.
- 4. L gastric a.
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Branches of thoracic a.
- - posterior intercostals
- - bronchial aa.
- - esophageal aa.
- - pericardial branches
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