Spike activity recorded from the organ of Corti.

During microelectrode passes through the inner hair cell region of the organ of Corti, spike activity is frequently encountered. We have obtained both extracellular and intracellular records from afferent terminals or dendrites. The response characteristics of all-or-none spike trains mimic those recorded from primary auditory axons. EPSPs may be identified, either associated with the spikes or in the absence of a spike. Inferences may be made about the nature of neurotransmitter quantum release from inner hair cells.