Defective function of which of the
following causes hyperacusis ?
a) VIII nerve
b) 7th nerve
c) Stapedius muscles
d) Any of the above
Correct Answer - D
Ans. is ‘d’ i.e., Any of the above
Hyperacusis
Hyperacusis is hearing normal voice as louder.
The protective mechanisms a normal ear employs to minimize the
harmful effects of loud noise are malfunctioning in hyperacusis.
So, noise may seem too loud even with hearing protection.
There is some speculation that the efferent portion of the auditory
nerve is selectively damaged while the hair cells that allow us to
hear pure tones in an audiometric evaluation remains intact.
Some have said it involves direct malfunction of facial nerve; as a
result, the stapedius muscle is unable to dampen sound.