Oculomotor nerve palsy: Difference between revisions
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==Overview== | ==Overview== | ||
Damage to the [[oculomotor nerve]], termed '''oculomotor nerve palsy''' is known by the '''down n' out''' symptoms. | Damage to the [[oculomotor nerve]], termed '''oculomotor nerve palsy''' is known by the '''down n' out''' symptoms. | ||
==Pathophysiology== | |||
The affected eye looks downward, because the [[superior oblique muscle|superior oblique]] (innervated by [[cranial nerve IV]]), is unantagonized by the paralyzed [[superior rectus muscle|superior rectus]] and [[inferior oblique muscle|inferior oblique]] and looking outwards, because the [[lateral rectus muscle|lateral rectus]] (innervated by [[cranial nerve VI]]) is unantagonized by the paralyzed [[medial rectus muscle|medial rectus]]. | |||
==Diagnosis== | ==Diagnosis== |
Revision as of 22:33, 14 July 2012
Oculomotor nerve palsy | |
ICD-10 | H49.0 |
---|---|
ICD-9 | 378.52 |
DiseasesDB | 2861 |
MeSH | D015840 |
Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]
Overview
Damage to the oculomotor nerve, termed oculomotor nerve palsy is known by the down n' out symptoms.
Pathophysiology
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.
Diagnosis
Physical Examination
Neurology
- Ptosis, or drooping of the eyelid, because the levator palpebrae superioris muscle (eyelid lifting muscle) is innervated by the oculomotor nerve.
External links
- Animation at mrcophth.com