DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Cochlear implant. Close-up of a cochlear implant hearing aid on the head of an 8-year-old boy with deafness caused by the use of gentamicin to treat meningitis at age 1. The implant consists of the sound processor that fits behind the ear, which passes sound signals to the transmitter (circular) attached to the scalp. The transmitter sends the information to electrodes implanted in the cochlea of the inner ear. The electrical impulses from the cochlea are passed to the brain, allowing the person to hear.
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