Anatomy In left subclavian artery, the branches of the first part of the subclavian artery are all EXCEPT: A Vertebral artery B Thyrocervical trunk C Internal thoracic artery D Costocervical trunk 💡 Explanation In left subclavian artery, the branches of the first part of the subclavian artery are all EXCEPT: ✓ Correct Answer: D. Costocervical trunk