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What are the roles of the outer, middle, and inner ear in hearing?
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sound reception
Auditory mechanisms in insects. (Left) A scolophore organ. (Top right) The mosquito ear. (Centre right) The ear of the cicada Magicicada septendecim. (Bottom right) The ear of the grasshopper.
The human ear is an organ responsible for hearing and equilibrium, functioning through three distinct anatomical sections that process sound waves.1
- Outer Ear: Comprising the auricle and the external auditory canal, its primary role is to collect sound waves and guide them toward the tympanic membrane (eardrum).1
- Middle Ear: This air-filled cavity contains the auditory ossiclesâthe malleus, incus, and stapesâwhich form a chain that conducts sound vibrations from the tympanic membrane to the inner ear. Muscles in this area, such as the stapedius, can reflexively contract to reduce the intensity of high-level sounds, providing a protective function for the inner ear.12
- Inner Ear: Located within the temporal bone, this system includes the cochlea, which houses the sensory organs for hearing. Within the cochlea, hair cells in the organ of Corti perform transduction, converting mechanical vibrations into electrochemical nerve impulses that are transmitted to the brain via the vestibulocochlear nerve.13