1.3 Synergistic &Antagonistic Muscles(Sherrington's Law) co Synergistic muscles: same field of action of the same eye Muscle Primary action Secondary action Superior Rectus Elevation Adduction Intorsion Inferior oblique Extorsion Elevation. Abduction Antagonistic muscles opposite field of action of the same eve Muscle Primary action Secondary action Medial rectus Adduction None Lateral rectus Abduction None 复大学附属眼耳鼻喉科医院1.3 Synergistic &Antagonistic Muscles(Sherrington’s Law) Synergistic muscles： same field of action of the same eye Antagonistic muscles： opposite field of action of the same eye Muscle Primary action Secondary action Superior Rectus Elevation Adduction,Intorsion Inferior Oblique Extorsion Elevation,Abduction Muscle Primary action Secondary action Medial Rectus Adduction None Lateral Rectus Abduction None