- Arises in the thorax as the third branch of the aortic arch behind the left edge of the manubrium sterni.
- Its root is behind and to the left of the root of the left common carotid artery
- Short course in the superior mediastinum
Chief relations of thoracic portion
Anterior
- Left brachiocephalic vein
- Left phrenic nerve
- Left vagus nerve
- Left common carotid artery
- Posterior
- Left pleura
Right
- Trachea
- Left recurrent laryngeal nerve
- Oesophagus
- Thoracic duct
Left
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