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Sixth nerve palsy
Neuro-Ophthalmology
Key Points
- •CN6 palsy is the most common acquired ocular motor palsy in adults; abducens nerve has the longest intracranial subarachnoid course (~50–55 mm)
- •Microvascular etiology (DM, HTN) is most common in adults >50; spontaneous recovery in 70–85% within 3–6 months
- •CN6 palsy is the classic 'false localizing sign' - bilateral CN6 palsy = raised ICP until proven otherwise
- •Gradenigo syndrome triad: CN6 palsy + V1/V2 facial pain + otorrhea (petrous apicitis from otitis media)
- •A nuclear CN6 lesion produces an ipsilateral conjugate gaze palsy, NOT just abduction deficit (internuclear neurons also affected)
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17 more sections are included with the Clinical plan.
- Definition
- Epidemiology
- Aetiology and causes
- Pathogenesis
- Classification
- Risk factors and associations