This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Upper Extremity, Subject name: Anatomy
Winging of scapula is seen due to paralysis of- 
Select and explain. 
A. Serratus anterior, B. Latissimus dorsi, C. pectoralis major, D. Levator scapulae
A: Serratus anterior
Answer: A: Serratus anterior 
Explanation: Ans. is 'a' i.e., Serratus anterior * Winging of scapula is caused most commonly by serratus anterior palsy.* This is typically caused by damage to long thoracic nerve (nerve to serratus anterior).