Left subclavian artery


  • 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

  • Left brachiocephalic vein
  • Left phrenic nerve
  • Left vagus nerve
  • Left common carotid artery
  • Posterior
  • Left pleura


  • Trachea
  • Left recurrent laryngeal nerve
  • Oesophagus
  • Thoracic duct


    • Left pleura