<prompt> Trapezius muscle is attached to all structures EXCEPTFirst ribClavicleScapulaOcciput  <response>: Trapezius is a upper back muscle triangular in shape. Origin- Occipital bone Cervical spine Thoracic spine Inseion- Clavicle lateral 13rd Acromian process of scapula Spine of scapula Supplied by Spinal acessory nerve. Action - pulls the shoulder upwards. 