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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, or shoulder blade, is the flat triangular bone that lies on the upper portion of the back. It attaches to the ribs on its under surface and to the humerus laterally. It has several important landmarks because it is a very important muscle attachment area in the shoulder complex.