<prompt> Winging of scapula is due to paralysis ofPectoralis majorSerratus anteriorPectoralis minorLatissimus dorsi  <response>: 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. 