Sixth nerve palsy: Difference between revisions
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Synonyms and Keywords: Cranial nerve VI palsy, Cranial [[mononeuropathy]] VI, Lateral rectus palsy | '''''Synonyms and Keywords:''''' Abducens nerve palsy, Cranial nerve VI palsy, Cranial [[mononeuropathy]] VI, Lateral rectus palsy | ||
==Overview== | ==Overview== | ||
Sixth nerve palsy is a disorder associated with dysfunction of [[cranial nerve]] VI (the [[abducens nerve]]) which is responsible for contracting the [[lateral rectus muscle]] to [[Anatomical terms of motion|abduct]] (i.e. turn out) the [[eye]]. The inability of an eye to turn outward results in [[medial strabismus]] of which the primary symptom is [[double vision]] in which the two images appear side-by-side. | |||
==Pathophysiology== | |||
Because the nerve emerges near the bottom of the [[brain]], it is often the first nerve compressed when there is any [[rise in intracranial pressure]]. | |||
==Epidemiology and Demographics== | ==Epidemiology and Demographics== | ||
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==Causes== | ==Causes== | ||
*Adults | *Adults | ||
**More common: Vasculopathic ([[diabetes]], [[hypertension]], [[atherosclerosis]]), [[Physical trauma|trauma]], [[idiopathic]]. | **More common: Vasculopathic ([[diabetes]], [[hypertension]], [[atherosclerosis]]), [[Physical trauma|trauma]], [[idiopathic]]. | ||
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*Children | *Children | ||
**Benign postviral condition, [[Gradenigo's syndrome]], [[pontine]] [[glioma]], trauma. | **Benign postviral condition, [[Gradenigo's syndrome]], [[pontine]] [[glioma]], trauma. | ||
==Diagnosis== | |||
===Symptoms=== | |||
*[[Double vision]] | |||
==References== | ==References== | ||
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[[Category:Neurological disorders]] | [[Category:Neurological disorders]] | ||
[[Category:Neurology]] | [[Category:Neurology]] | ||
Latest revision as of 17:20, 15 June 2015
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]
Synonyms and Keywords: Abducens nerve palsy, Cranial nerve VI palsy, Cranial mononeuropathy VI, Lateral rectus palsy
Overview
Sixth nerve palsy is a disorder associated with dysfunction of cranial nerve VI (the abducens nerve) which is responsible for contracting the lateral rectus muscle to abduct (i.e. turn out) the eye. The inability of an eye to turn outward results in medial strabismus of which the primary symptom is double vision in which the two images appear side-by-side.
Pathophysiology
Because the nerve emerges near the bottom of the brain, it is often the first nerve compressed when there is any rise in intracranial pressure.
Epidemiology and Demographics
The abducens nerve is the most commonly affected ocular motor nerve[1].
Causes
- Adults
- More common: Vasculopathic (diabetes, hypertension, atherosclerosis), trauma, idiopathic.
- Less common: Increased intracranial pressure, giant cell arteritis, cavernous sinus mass (e.g. meningioma, aneurysm, metastasis), multiple sclerosis, sarcoidosis/vasculitis, postmyelography or lumbar puncture, stroke (usually not isolated).
- Children
- Benign postviral condition, Gradenigo's syndrome, pontine glioma, trauma.
Diagnosis
Symptoms
References
- ↑ Ehrenhaus, MP. Abducens Nerve Palsy. eMedicine.com. October 9, 2003.
See also
External links
- Animation at mrcophth.com