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Updated: Dec 21 2021


  • Summary
      • Trapezius
      • Origin
      • Medial third of superior nuchal line; external occipital protruberance, nuchal ligament, and spinous processes of C7 - T12 vertebrae
      • Insertion
      • Lateral third of clavicle, acromion, and spine of scapula
      • Action
      • Elevates retracts, and rotates scapula; superior fibers elevate, middle fibers retract, and inferior fibers depress scapula; superior and inferior fibers act together in superior rotation of scapula
      • Innervation
      • Spinal root of the accessory nerve (CN XI) (motor) and cervical nerves (C3 and C4) (pain and proprioception) (XI, C3, C4)
      • Arterial Supply
      • Transverse cervical artery
      • Relevant Approaches
      • Posterolateral (Costotransversectomy) Approach to Thoracic Spine
      • Relevant Conditions
      • Lateral Scapular Winging
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