During knife fight a person gets injured in the neck region and presents to you with weakness in raising right arm above head. On further examination winging of right scapula is noted. The injury has damaged

Spinal accessory nerve is quite superficial in the neck region and is damaged more often as compared to long thoracic nerve of Bell (which gets damaged in the axilla region more commonly). Both the muscles are involved in overhead abduction (90-1800) Both the muscles (SA and Trapezius) if paralysed can produce winging of scapula