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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).
C. sternal manubrium and medial one-third of clavicle; mastoid process and lateral half of superior nuchal line. The muscles that laterally rotate and depress the scapula, as in shrugging and lowering the shoulders, are the. A. trapezius and serratus anterior. B. pectoralis minor and serratus anterior.