This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Anatomy
After radical mastectomy there was injury to the long thoracic nerve. The integrity of the nerve can be tested at the bedside by asking the patient to 
Select and explain. 
A. Shrug the shoulders, B. Raise the arm above the head on the affected side, C. Touch the opposite shoulder, D. None of the above
B: Raise the arm above the head on the affected side
Answer: B: Raise the arm above the head on the affected side 
Explanation: Long thoracic nerve innervates Serratus anterior. Serratus anterior originates from outer surface of upper 8 ribs and inserts onto inferior angle and medial border of scapula. 
Actions :

It rotates the scapula to help in overhead abduction.
Steady the scapula to carry weight.
Pushing of arm forward in horizontal position.
Helps in forced inspiration.