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NEUROSAE 2018 ANNUAL MEETING EDITION (VOLUME 10, ISSUE 3)
QUESTION 86 OF 100
Ptosis associated with Horner syndrome is due to impairment in which of the following muscles?
B. Levator palpebrae superioris **
C. Superior oblique
D. Superior rectus
** = Your answer
Weakness of the levator palpebrae superioris and superior rectus muscles is caused by oculomotor nerve palsy. Superior oblique weakness develops as a result of trochlear nerve palsy. Frontalis weakness is due to facial nerve palsy. Denervation of the sympathetically innervated Müller’s muscle leads to ptosis in Horner syndrome.
Freedman KA, Brown SM. Topical apraclonidine in the diagnosis of suspected Horner syndrome. J Neuroophthalmol. 2005 Jan;25(2):83-85.
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