The trapezius muscle plays a key role in the movement of the forelimb - both in its forward “reach” phase and during retraction back toward the body. The thoracic part of the trapezius (Trapezius thoracis) is an essential link in the forelimb extension chain, running from the fore toe up to the poll. Its main function is to stabilise the top of the scapula, allowing the rest of the chain to lift and swing the limb forward efficiently. Weakness or atrophy of this muscle often leads to scapular in