Like a swivelling seat for a gunnery shooter, the scapular must move to provide a base or platform of movement for the arm. This means that wherever the arm moves to, the scapula must move correspondingly to enable a platform or base against which to push. As the arm (humerus) is able to move so widely in such a wide arc of motion, the scapula must be able to move and rotate in a corresponding fashion providing adequate support and enabling efficient, functional biodynamics.
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