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Schematic of the cochlea, the auditory nerve, and the brain stem. The syringe indicates the HNPC injection site in the auditory nerve trunk by the internal auditory meatus. AN: auditory nerve; TB: temporal bone; CPAC: cerbellopontine angle cistern; IAM: internal auditory meatus; HC: hair cell; SGN: spiral ganglion neuron; AVCN: anteroventral cochlear nucleus; PVCN: posteroventral cochlear nucleus; DCN: dorsal cochlear nucleus; BS: brain stem.
