This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Upper limb, Subject name: Anatomy
Anterior wall of axilla is formed by 
Select and explain. 
A. Pectoralis major, B. Humerus, C. Latissimus dorsi, D. Teres major
A: Pectoralis major
Answer: A: Pectoralis major 
Explanation: Anterior wall of axilla is formed by pectoralis major in front, clavipectoral fascia, and pectoralis minor. Upper pa of shaft of humerus in the region of bicipital groove forms a pa of lateral wall of axilla.Posterior wall of axilla is formed by latissimus dorsi below along with subscapularis and teres major.B D Chaurasia 7th edition Page no: 49