<prompt> Retraction of scapula at sternoclavicular joint is done by:Serratus anteriorTrapeziusSubscapularisSupraspinatus  <response>: 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. 