Other Names Chest Shoulder Heads 3 Heads Also see Pectoralis Major Clavicular Head Sternal Head MovementScapula Abduction Downward Rotation (During Abduction) Depression AttachmentsOrigin Ribs (3rd to 5th) Anterior Surface Insertion Scapula (Superior Anterior) Caracoid Process (Medial Border) Related Muscles Serratus Anterior