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Why are sound receptors considered mechanoreceptors?

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Diagram showing auditory mechanisms in insects, including labeled illustrations of a scolophore organ, the mosquito ear with antenna shaft and scolophores, the cicada ear with auditory capsule and tympanic membrane, and the grasshopper ear with sensory body and tympanic membrane. — 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.

Sound receptors are classified as mechanoreceptors because they function by detecting and transducing mechanical stimuli—specifically physical vibrations—into electrical nerve impulses.12

In the human ear, this process occurs within the cochlea, where sound waves cause the basilar membrane to vibrate. This movement creates shearing forces between the reticular lamina and the tectorial membrane, which physically displace or bend the stereocilia located on the hair cells.134

This mechanical bending of the stereocilia acts as the trigger for transduction: when the hairs are deflected, ion channels in the cell membrane open or close, altering the flow of ions and generating an electrical receptor potential. Consequently, the hair cell releases neurotransmitters to stimulate the auditory nerve fibers. Because the primary mechanism of detection relies on the physical deformation of cellular structures, these receptors are fundamentally defined as mechanoreceptors.142