Oculomotor nerve palsy

Damage to the oculomotor nerve, termed oculomotor nerve palsy is known by the down n’ out symptoms.

The affected eye looks downward, because the superior oblique (innervated by cranial nerve IV), is unantagonized by the paralyzed superior rectus and inferior oblique and looking outwards, because the lateral rectus (innervated by cranial nerve VI) is unantagonized by the paralyzed medial rectus.

• The affected eye looks downward and outward

• Ptosis, or drooping of the eyelid, because the levator palpebrae superioris muscle (eyelid lifting muscle) is innervated by the oculomotor nerve.
• Strabismus

• Animation at mrcophth.com

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