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Schematic representation of the cochlea showing auditory nerve bipolar ganglion cells, their axons directed to the cochlear nucleus, and their dendrites directed to the hair cells. Approximately 95% of the dendrites project to inner hair cells with each inner hair cell making synaptic connections with up to 25 dendrites. Electrical stimulation through a cochlear implant bypasses the terminal portions of the auditory nerve and activates the nerve in the region of the ganglion cells.
