Why does loose tensor tympani cause hypoacusis?

In summary, if the tensor tympani muscle is loose, then the ear drum is also loose and will vibrate even by weak sound waves, which will increase the vibration of the malleus, incus, and stapes. This will cause hyperacusis.
  • #1
tarekatpf
140
1
If the tensor tympany is loose, the ear drum is also loose. But then, the ear drum will vibrate even by weak sound waves, which will cause increased vibration of malleus, incus, and stapes. Isn't that supposed to cause hyperacusis instead?
 
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  • #2
tarekatpf said:
If the tensor tympany is loose, the ear drum is also loose. But then, the ear drum will vibrate even by weak sound waves, which will cause increased vibration of malleus, incus, and stapes. Isn't that supposed to cause hyperacusis instead?

The primary purpose of the tensor tympani muscle (TTM) is to damp loud noises and adjust for low frequency sound waves. If it is flaccid, the middle and inner ear is subject to injury. The results of injurious loud noises or acoustic shock (AS) can be either hypoacusis (hearing loss) or hyperacusis. CNS involvement may play a role as to which it is. Clearly, in the absence of protection against loud noises, the tympanic membrane (ear drum or TM) and possibly the middle ear bones and cochlea are subject to injury which can lead to hearing loss.

As far as I know, the TTM does not significantly impinge on hearing directly, but primarily acts in a protective role. By relaxing, it serves to augment lower frequencies in conjunction with the stapedius muscle. However, this apparent effect is due to the fact that contraction of the TTM primarily decreases acuity in the lower frequencies.

http://www.noiseandhealth.org/artic...;issue=63;spage=117;epage=128;aulast=Westcott

EDIT: In theory, a loose TTM would result in a flaccid TM resulting in a high frequency hearing loss at least, but that doesn't seem to happen. The TM quickly regains its proper level of tension.

http://books.google.com/books?id=HS...epage&q=flaccid tensor tympani muscle&f=false
 
Last edited:
  • #3
SW VandeCarr said:
The primary purpose of the tensor tympani muscle (TTM) is to damp loud noises and adjust for low frequency sound waves. If it is flaccid, the middle and inner ear is subject to injury. The results of injurious loud noises or acoustic shock (AS) can be either hypoacusis (hearing loss) or hyperacusis. CNS involvement may play a role as to which it is. Clearly, in the absence of protection against loud noises, the tympanic membrane (ear drum or TM) and possibly the middle ear bones and cochlea are subject to injury which can lead to hearing loss.

As far as I know, the TTM does not significantly impinge on hearing directly, but primarily acts in a protective role. By relaxing, it serves to augment lower frequencies in conjunction with the stapedius muscle. However, this apparent effect is due to the fact that contraction of the TTM primarily decreases acuity in the lower frequencies.

http://www.noiseandhealth.org/artic...;issue=63;spage=117;epage=128;aulast=Westcott

EDIT: In theory, a loose TTM would result in a flaccid TM resulting in a high frequency hearing loss at least, but that doesn't seem to happen. The TM quickly regains its proper level of tension.

http://books.google.com/books?id=HS...epage&q=flaccid tensor tympani muscle&f=false

Thank you very much for your answer, and the links. And sorry about the belated reply.
 

1. What is the tensor tympani muscle and how does it affect hearing?

The tensor tympani muscle is a small muscle located in the middle ear. It is responsible for controlling the tension of the eardrum, which can affect the transmission of sound waves and therefore, impact hearing.

2. How does a loose tensor tympani cause hypoacusis (hearing loss)?

When the tensor tympani muscle becomes loose, it is unable to properly tense the eardrum. This can result in an inability to properly transmit sound waves to the inner ear, leading to hypoacusis or hearing loss.

3. What are the symptoms of a loose tensor tympani?

Symptoms of a loose tensor tympani may include muffled or distorted hearing, increased sensitivity to loud noises, and ear discomfort or pain.

4. What are the possible causes of a loose tensor tympani?

A loose tensor tympani can be caused by a variety of factors, including genetics, aging, or damage to the middle ear. It may also be a result of certain medical conditions or medications.

5. How is a loose tensor tympani treated?

Treatment for a loose tensor tympani may include medication to relax the muscle or surgery to tighten it. In some cases, a hearing aid may also be recommended to help improve hearing. It is important to consult with a healthcare professional for proper diagnosis and treatment.

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