TABLE 28.1 EXTRAOCULAR MUSCLES Muscle a Medial rectus Cranial nerve III (inferior division) Inferior rectus III (inferior division) Lateral rectus VI Superior rectus III (superior division) Superior oblique IV Levator palpebrae III (superior c division) a Inferior Action b Eye position in palsy Adduction Exotropia Downward gaze Hypertropia Abduction Upward gaze Esotropia Hypotropia Downward gaze Eyelid Hypertropia Ptosis (lid) oblique not included for simplicity Isolated palsy of the inferior oblique is extremely rare in the horizontal or vertical field only Cyclorotatory movements not included c By definition, not truly an extraocular muscle b Action