<prompt> Superficial incision on posterior triangle of neck leads toDifficulty in shrugging of shoulderDifficulty in start of abductionDifficulty in rotation of face towards the same sideDifficulty in flexion  <response>: Ans is a i.e. difficulty in shrugging of shoulder Nerves in the posterior triangle of neck only motor nervesSpinal accessory nerveTwo small branches to levator scapulaeC3,4Nerve to RhomboideNerve to serratus anteriorNerve to subclaviusSuprascapular nerveWhen a superficial incision is made in the post triangle, the nerve most likely to be injured is spinal accessory nerve, because it runs through a tunnel in the fascia forming the roof of triangle.Rest all nerves are either deep or have a very small course in the lower part of the triangleSpinal accessory nerve supplies 2 muscles -Trapezius andsternocleidomastoidAction of Trapezius :Elevation of scapulaRetraction of scapulaRotation of scapulaAction of sternocleidomastoid :Turns the face to opposite side Tilts the head towards the same shoulder.When SCM of both sides contracts draws the head forwards. 