Retraction of scapula at sternoclavicular joint is done by:
Serratus anterior
Trapezius
Subscapularis
Supraspinatus
Retraction means moving backward of scapula at sternoclavicular joint. It is done by the following muscles: Trapezius Rhomboid major Rhomboid minor. Subscapularis helps in medial rotation of humerus. Serratus anterior helps in protraction of scapula. Supraspinatus helps in adduction.
Upper limb bones and muscles (proximal region) & Scapular movements