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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).
This pattern is winging of the entire medial border of the scapula at rest. It becomes more prominent in the cocking position and after repetitive elevation of the upper extremity. It is caused by fatigue of the scapula stabilising muscles (trapezius and rhomboids).