During knife fight a person gets injured in the neck region and presents to emergency depament with weakness in raising right arm above head. On fuher examination winging of right scapula is noted. The injury has damaged
Spinal accessory nerve 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 (Serratus anterior and Trapezius) are involved in overhead abduction (90-180deg). Both the muscles also keep the medial border of the scapula approximated to the chest wall and if paralysed can produce winging of scapula
Spinal accessory nerve
Long thoracic nerve of Bell
Suprascapular nerve
Dorsal scapular nerve