<prompt> Shrugging of shoulder following neck surgery due to injury to:-Spinal accessory nerveThoracodorsal nerveBells nerveVagus nerve  <response>: Shrugging of shoulder is because of trapezius muscle, supplied by spinal accessory nerve Radical neck dissection: - Removal of level I - V lymph nodes - Removal of spinal accessory nerve, internal jugular vein and sternocleidomastoid muscle 