A 30 year old man came to the outpatient depament because he had suddenly developed double vision. On examination it was found that his right eye, when at rest, was turned medially. The most likely anatomical structures involved are:
C i.e. Lateral rectus & abducent nerve Abducent (6th) nerve supply lateral rectus muscle (LR6) Q. Palsy of lateral rectus presents with fully adducted eye (due to unopposed medial rectus), inability to abduct eye Q & diplopia in all gaze (maximum in ipsilateral outward gaze)Q except on looking to the side opposite to lesion (i.e. on normal side)
Medial rectus and superior division of oculomotor nerve
Inferior oblique and inferior division of oculomotor nerve
Lateral rectus and abducent nerve
Superior rectus and trochlear nerve