<prompt> Winging of scapula is due to damage of:Axillary nerveLong thoracic nerveMedian nerveUlnar nerve  <response>: Ans. B Long thoracic nerveRef: BDC, 6th ed. vol. I pg. 55-56; 3rd ed. Vol. I pg. 45-50; 180,181 Winging of scapula is due to damage of long thoracic nerve due to paralysis of serratus anterior muscle. Serratus anterior helps in vertical overhead abduction assisted by trapezius, forward punch assisted by pectoralis minor forced inspiration. Its paralysis leads to winging of scapula. Nerve Supply of Serratus anterior- Long Thoracic Nerve Nerve of Bell C5, C6, C7 Action of Serratus anterior muscle Rotates the scapula so that glenoid cavity is raised upward forward- Helps in Vertical over head abduction in this action assisted by Trapezius muscle. Draws the scapula forward around the thoracic wall so paralysis leads to winging of scapula. Also used when arm is pushed forward in horizontal position as in forward punch helped by Pectoralis minor in this action. Steadies the scapula during weight carrying. Helps in forced inspiration Accessory muscle of inspiration. Because of greater pull exerted on the inferior angle, inferior angle passes laterally and forward and the glenoid cavity is raised upward forward; in this action the muscle is assisted by trapezius. 