Anatomy A 19 year old complains of pain whilst hunching his left shoulder. Which of the following muscles is the chief protractor of scapula? A Serratus anterior B Rhomboidis major C Deltoid D Pectoralis major 💡 Explanation A 19 year old complains of pain whilst hunching his left shoulder. Which of the following muscles is the chief protractor of scapula? ✓ Correct Answer: A. Serratus anterior