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  #1  
Old 01-08-2012
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Default Hyperacusis

Can V CN palsy cause hyperacusis since it innervates the tensor tympani?
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Old 01-09-2012
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Default I do no think so...

I think that it will be hypoacusis... no control to modulate the waves that enter the ear.
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Old 01-09-2012
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CN V - Facial Nerve supplies stapedius muscle via the stapedius nerve (branch of facial nerve).

it controls the oscillation of stapes.So if facial nerve is paralysed there is wider oscillation of stapes and increased sensitivity to sound causing hyperacusis
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Old 01-09-2012
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Sorry i meant CN VII facial nerve
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Old 01-09-2012
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Yep, Hyperacusis (sensitivity to loud noise) can result from paralysis of any of the middle ear muscles :Stapedius (CN 7 : Nerve to stapedius)and Tensor tympani ( CN 5 : mandibular branch)

The diffirence is in Stapedius m. paralysis there is hyperacusis to sounds in general ,while in Tensor tympani paralysis the hyperacusis is mainly to the sound produced from chewing.
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