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| − | The '''acoustic reflex''' (or '''stapedius reflex''') is an involuntary muscle contraction that occurs in the [[middle ear]] of mammals in response to high-intensity sound stimuli. |
+ | The '''acoustic reflex''' (or '''stapedius reflex''' or '''intra aural muscle reflex''') is an involuntary muscle contraction that occurs in the [[middle ear]] of mammals in response to high-intensity sound stimuli. |
When presented with a high-intensity sound stimulus, the [[stapedius]] and [[tensor tympani]] muscles of the [[ossicles]] contract. The stapedius pulls the [[stapes]] (stirrup) of the middle ear away from the oval window of the [[cochlea]] and the tensor tympani muscle pulls the [[malleus]] (hammer) away from ear drum. The reflex decreases the transmission of vibrational energy to the [[cochlea]], where it is converted into electrical impulses to be processed by the [[brain]]. The acoustic reflex normally occurs only at relatively high intensities; activation for quieter sounds can indicate ear dysfunction and absence of acoustic reflex can indicate neural [[deafness|hearing loss]]. |
When presented with a high-intensity sound stimulus, the [[stapedius]] and [[tensor tympani]] muscles of the [[ossicles]] contract. The stapedius pulls the [[stapes]] (stirrup) of the middle ear away from the oval window of the [[cochlea]] and the tensor tympani muscle pulls the [[malleus]] (hammer) away from ear drum. The reflex decreases the transmission of vibrational energy to the [[cochlea]], where it is converted into electrical impulses to be processed by the [[brain]]. The acoustic reflex normally occurs only at relatively high intensities; activation for quieter sounds can indicate ear dysfunction and absence of acoustic reflex can indicate neural [[deafness|hearing loss]]. |
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==See also== |
==See also== |
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| + | *[[Acoustic startle reflex]] |
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==References== |
==References== |
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*[[Otoacoustic emission]] |
*[[Otoacoustic emission]] |
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| − | + | [[Category:Neurology]] |
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| − | + | [[Category:Reflexes]] |
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| − | + | [[Category:Auditory system]] |
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{{enWP|Acoustic reflex}} |
{{enWP|Acoustic reflex}} |
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The acoustic reflex (or stapedius reflex or intra aural muscle reflex) is an involuntary muscle contraction that occurs in the middle ear of mammals in response to high-intensity sound stimuli.
When presented with a high-intensity sound stimulus, the stapedius and tensor tympani muscles of the ossicles contract. The stapedius pulls the stapes (stirrup) of the middle ear away from the oval window of the cochlea and the tensor tympani muscle pulls the malleus (hammer) away from ear drum. The reflex decreases the transmission of vibrational energy to the cochlea, where it is converted into electrical impulses to be processed by the brain. The acoustic reflex normally occurs only at relatively high intensities; activation for quieter sounds can indicate ear dysfunction and absence of acoustic reflex can indicate neural hearing loss.
See also
References
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