The trapezius is a large, superficial, triangular muscle that spans the upper back and neck. It originates along the medial third of the superior nuchal line of the occiput, external occipital protuberance, ligamentum nuchae, and the spinous processes of C7 to T12. It inserts laterally onto the lateral third of the clavicle, the acromion, and the spine of the scapula. It’s divided into three parts: the upper fibres (which run downward and laterally), the middle fibres (which run horizontally), a

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