Cochlear implant. Artwork of a section through the outer and inner ear showing a cochlear implant, a prosthetic hearing device. Sound from an external microphone (behind external ear, top left) is transmitted, via wires, to electrodes (white dots) that are implanted into the cochlea (coil, centre right) of the inner ear. The electrodes transmit the sound as electrical impulses to the auditory nerve, allowing the person to hear the sounds.
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