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British Medical Bulletin 43:838-855 (1987)
© 1987 The British Council

research-article

Physiology of the cochlear nerve and cochlear nucleus

A R Palmer

MRC Institute of Hearing Research Nottingham

Abstract

The cochlear nerve is the sole input pathway from the cochlea to the central nervous system. The responses of fibres in the cochlear nerve can, to a first approximation, be considered as the rectified output of a bank of linear bandpass filters, which in most cases have limited dynamic ranges. The filtered waveform of low-frequency sounds can, nevertheless, be signalled over a wide intensity range in the fine temporal discharge pattern. All fibres of the cochlear nerve terminate in the cochlear nucleus where, by contrast, there are many cell types and interconnections which result in diverse responses even to simple sounds. Responses in the ventral division of the cochlear nucleus resemble more closely those of cochlear nerve fibres than do responses in the dorsal division and many of the cells in the ventral division are true 1-to-1 relays of the cochlear nerve input. Neural inhibitory effects are more pronounced in the dorsal division and consequently the responses to sound there are more complicated.


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