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Cranial Nerve Lesions (Optic = II (Homonymous hemianopia: affects visual…
Cranial Nerve Lesions
Optic = II
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Optic neuritis: pain on moving eye, loss of central vision caused by MS, syphilis
Bitemporal hemianopia: optic chiasm compression from pituitary adenoma, internal carotid aneurysm
Ishcaemia papillopathy: swelling of optic disc due to stenosis of posterior ciliary artery caused by giant cell arteritis
Bilateral blindness: diabetes, MS
Papilloedema: bilaterally swollen discs, caused by raised ICP from tumour, encephalitis, hydrocephalus
Monocular blindness: lesions of one eye or optic nerve from MS, giant cell arteritis
Optic atrophy: pale optic discs, caused by MS, glaucoma, syphilis, optic nerve compression
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Facial = VII
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LMN causes: Bell's palsy, polio, skull fracture
UMN causes: stroke, tumour
Accessory = XI
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Caused by trauma, brainstem lesions, neck tumours
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Olfactory = I
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Causes: trauma, resp tract infection, meningitis, frontal lobe tumour
Oculomotor = III
Caused by diabetes, syphilis, raised ICP
Nerve palsy: ptosis, large pupil
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Trigeminal = V
Caused by MS, Wernicke's encephalopathy, pontine stroke
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Vestibulocochlear = VIII
Caused by noise damage, Paget's, herpes zoster
Problems with hearing, balance and vertigo
Glossopharyngeal = IX
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Caused by trauma, brainstem lesions, neck tumours
Hypoglossal = XII
Caused by polio, tumours, stroke, TB, trauma
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Abducens = VI
Caused by herpes zoster, nasopharyngeal cancer
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