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
Winging of scapula is due to paralysis of 
Select and explain. 
A. Pectoralis major, B. Serratus anterior, C. Pectoralis minor, D. Latissimus dorsi
B: Serratus anterior
Answer: B: Serratus anterior 
Explanation: WINGING OF SCAPULA: Paralysis of serratus anterior causes 'winging of scapula' It is supplied by the long thoracic nerve. FEATURES: Medial border of the scapula becomes unduly prominent The inferior angle becomes prominent. The arm cannot be abducted beyond 90degree. REF: BD Chaurasia 7th edition page no: 12.