Sixth nerve palsy
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| Sixth nerve palsy Classification and external resources | ||
 | ||
|---|---|---|
| Figure showing the mode of innervation of the Recti medialis and lateralis of the eye. | ||
| ICD-10 | H49.2 | |
| ICD-9 | 378.54 | |
| DiseasesDB | 2868 | |
| eMedicine | oph/158 | |
| MeSH | C10.292.150 | |
Sixth nerve palsy, or abducens 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.
The abducens nerve is the most commonly affected ocular motor nerve[1].
Alternative names
- Cranial nerve VI palsy
- Cranial mononeuropathy VI
- Lateral rectus palsy
Causes
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.
- 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.
References
- "Cranial Mononeuropathy VI", Medline Plus Medical Encyclopedia.[1]
- "Cranial Nerve VI Palsy", Handbook of Ocular Disease Management, 2000 - 2001 Jobson Publishing L.L.C. (2000-2001).[2]
- The Wills Eye Manual: Office and Emergency Room Diagnosis and Treatment of Eye Disease, J.B. Lippincott, 1994.
See also
External links
- Animation at mrcophth.com
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Acknowledgement and Attribution Regarding Sources of Content
Some of the initial content on this page may be incorporated in part from copyleft sources in the public domain including wikis such as Wikipedia and AskDrWiki. Drug information for patients came from the The National Library of Medicine. Infectious disease information may have come from the Centers for Disease Control (CDC). Differential Diagnoses are drawn from clinicians as well as an amalgamation of 3 sources: 1.The Disease Database; 2. Kahan, Scott, Smith, Ellen G. In A Page: Signs and Symptoms. Malden, Massachusetts: Blackwell Publishing, 2004:3; 3. Sailer, Christian, Wasner, Susanne. Differential Diagnosis Pocket. Hermosa Beach, CA: Borm Bruckmeir Publishing LLC, 2002:7 .
