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Backward movement toward the midline of the body; moving the scapula back toward the spine during retraction of the shoulder girdle. Typically accompanies Shoulder External Rotation, Transverse Abduction, and Tranverse Extension. 1  Trapezius (middle fibers). 2  Trapezius (lower fibers).
The scapula, more commonly known as the shoulder blade, is a flat bone shaped much like a triangle. This bone attaches the arm bone to the bones of the ribs. Pain in this area of the body is quite common and can have several potential causes, the most common being excessive or strenuous physical activity. Scapula pain can also be caused by sleeping position or degenerative diseases such as arthritis.