ACOUSTIC REFLEX Meaning and
Definition
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The acoustic reflex refers to a protective mechanism of the auditory system that involves an automatic contraction of the middle ear muscles in response to loud sounds. This reflex, also known as the stapedius reflex or the middle ear muscle reflex, serves to decrease the transmission of sound vibrations to the inner ear, thereby preventing potential damage to delicate structures within the cochlea.
The acoustic reflex is initiated when sound intensity reaches a certain threshold, typically between 70 and 100 decibels. Once this threshold is exceeded, a neuronal signal is sent from the brainstem to the muscles in the middle ear—the tensor tympani and the stapedius muscles. This signal triggers a reflexive contraction of these muscles, which results in the stiffening of the eardrum (tympanic membrane) and a reduction in the movement of the ossicles (small bones in the middle ear).
By limiting the transmission of high-intensity sounds, the acoustic reflex helps to safeguard the sensory cells of the inner ear from potential damage. This reflex is particularly important for individuals exposed to prolonged or repeated loud noises, such as musicians, construction workers, or individuals residing in noisy environments. It is also an essential component of auditory evaluations, as it can provide valuable information about the integrity and function of the auditory system.
Common Misspellings for ACOUSTIC REFLEX
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Etymology of ACOUSTIC REFLEX
The word "acoustic" originates from the Greek word "akoustikos", which means "pertaining to hearing or sound". The term "reflex", on the other hand, comes from the Latin word "reflexus", which means "turned back or reflected".
When combined, the term "acoustic reflex" refers to a natural involuntary reaction of the middle ear muscles in response to loud sounds. This reflex dampens the excessive vibrations caused by loud stimuli by contracting the tensor tympani muscle in the ear.
Therefore, while the word "acoustic" directly relates to sound or hearing, "reflex" implies the involuntary nature of this response.
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