Inner hair cells receive 95 % of the primary afferent axons. Single spiral ganglion axons each contact only one inner row receptor cell. Further, 20 to 40 individual fibers contact an inner row receptor cell and connect to only one target neuron, centrally.

• Inner hair cells receive 95 % of the primary afferent axons. Single spiral ganglion axons each contact only one inner row receptor cell. Further, 20 to 40 individual fibers contact an inner row receptor cell and connect to only one target neuron, centrally.