Intermediate Left Subclavian Artery Quiz

Q1. How does the origin of the left subclavian artery differ from that of the right?

• Both arise from the pulmonary trunk
• Left arises from the brachiocephalic trunk
• Right arises from the descending aorta
• Left arises directly from the aortic arch

Q2. Why does the left subclavian artery have a thoracic portion?

• It arises from the aortic arch
• It passes through the diaphragm
• It arises from the axillary artery
• It crosses the heart

Q3. Which structure lies medial to the thoracic portion of the left subclavian artery?

• Left common carotid artery
• Superior vena cava
• Azygos vein
• Right phrenic nerve

Q4. Which nerve crosses the anterior surface of the left subclavian artery?

• Right recurrent laryngeal nerve
• Right vagus nerve
• Left vagus nerve
• Greater splanchnic nerve

Q5. Which branch usually arises from the first part of the subclavian artery?

• Posterior circumflex humeral artery
• Superior thoracic artery
• Profunda brachii artery
• Vertebral artery

Q6. Which arterial trunk usually arises from the first part of the subclavian artery?

• Celiac trunk
• Brachiocephalic trunk
• Pulmonary trunk
• Thyrocervical trunk

Q7. Which branch usually arises from the second part of the subclavian artery?

• Internal thoracic artery
• Facial artery
• Costocervical trunk
• Vertebral artery

Q8. Which branch may arise from the third part of the subclavian artery?

• Vertebral artery
• Dorsal scapular artery
• Internal thoracic artery
• Superior thyroid artery

Q9. Which structure separates the subclavian artery from the subclavian vein?

• Anterior scalene muscle
• Pectoralis minor
• Middle scalene muscle
• Sternohyoid muscle

Q10. Between which scalene muscles does the subclavian artery pass?

• Sternocleidomastoid and trapezius
• Middle and posterior scalenes
• Anterior and posterior scalenes
• Anterior and middle scalenes