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13 Cards in this Set
- Front
- Back
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What are four areas that can be lesioned to cause diplopia?
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NMJ (myasthenia), muscle (thyroid opthalmopathy), CN III, IV, VI; brainstem
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What do you see in Weber's syndrome and what causes it?
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ipsilateral III nerve paresis w/ contralateral hemiparesis. Caused by lesion in CNIII and cerebral peduncles
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What you see in Benedict's syndrome and what causes it?
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ipsilateral CNIII nerve paresis w/ contralateral hemitremor caused by lesion to CNIII and red nucleus
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What sort of symptoms occur w/ aneurysms of the PCA-internal carotid artery?
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Dilated pupil (pupillary fibers first to go since they're on outside) and sudden onset of severe headache
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What sort of things do you see if the superior division of the eye is lesioned? inferior division?
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Superior division lesion causes PTOSIS & elevation deficit. Inferior division: NO PTOSIS, dilated pupil (PSNS fibers here), abnormal motility
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What clincial signs and symptoms are found in a patient w/ CNIV nerve palsey?
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Head tilt away from palseyed side, vertical diplopia (esp w/ stairs), pt. can't look down and in, vertical deviation on cover-uncover
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What things are unique to CN IV?
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Only CN to cross contralaterally in brainstem, has longest CN course in subarachnoid space making it more susceptible to trauma.
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What signs and symptoms are characteristic of cavernous sinus problems? What are causes of cavernous sinus problems?
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Have ophthalmoplegia(from CN III and IV) and trigeminal involvement (pain). Caused from infxn (cav sinus thrombosis), traumatic fistula (arterial blood in cav sinus), or tumor
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What are clinical findings w/ doral midbrain syndrome? What area is affected?
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Pretectum (post commisure possibly too) affected. Causes upward gaze paralysis, lid-retrxn, light-near dissociation, convergence retrxn nystagmus
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With downbeating nystagmus, where is the lesion?
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cervicomedullary junxn
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With upbeating nystagmus, where is the lesion?
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brainstem or medullary tumors
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With lateral nystagmus, where is the lesion and/or what causes it?
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associated w/ drugs or cerebellar lesions
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Where is the lesion when the person has see-saw nystagmus?
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optic chiasm
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