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costocervical trunk (anatomy)
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The costocervical arterial trunk arises from the second part of the subclavian artery on each side. It passes posteromedially and slightly superiorly over the suprapleural membrane and the pleural cupola.

Anterior to the neck of the first rib on each side, the costocervical trunk bifurcates to form the:

  • superior intercostal artery
  • deep cervical artery