This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Lower limb, Subject name: Anatomy
Which of the following is not a pa of chest wall? 
Select and explain. 
A. Pectoralis major, B. Pectoralis minor, C. Serratus anterior, D. Coracobrachialis
D: Coracobrachialis
Answer: D: Coracobrachialis 
Explanation: Muscles of anterior compament of arm are the coraccobrachialis, the biceps brchii and the brachialis. so, the choraccobrachialis is not consider to be the muscle of chest wall and it's ( coroccobrachialis ) origin is from the tip of the coracoid process of scapula and it's inseion is at the medial border of humerus. Ref : B D Chaurasia's Human Anatomy , seventh edition , volume 1 , pg, no., 90 ( table 8.1 )