What is this muscle? What are its attachments, its function, and innervation?
Trapezius attaches from the superior nuchal line, external occipital protuberance, ligamentum nuchae and cervical and thoracic spinous processes to the clavicle, acromion and scapular spine. It acts to elevate the scapula along with depression, retraction and superior rotation of the lateral angle. It is innervated by the accessory nerve(motor) and C3-C5(sensory).