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Modulation of activity in starling cochlear ganglion units by middle-ear muscle contractions, perilymph movements and lagena stimuli

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Summary

In the present study three groups of cochlear ganglion neurones were detected which differed in respect to their tone-evoked and spontaneous activity: auditory units which showed an irregular spontaneous discharge, non-auditory neurones with regular activity and such with an irregular spontaneous discharge pattern. Electricallyelicited contractions of the middle-ear muscle influenced the tone-evoked and/or the spontaneous activity of the auditory and the non-auditory neurones with irregular spontaneous discharge but not, however, the regularly firing units (Figs. 1–4). Similar results were obtained with imposed perilymph movements in the cochlea (evoked via the vestibular system; Figs. 5, 6). Fractions of all three groups of cochlear ganglion neurones were responsive to direct deformations of the membraneous lagena (Figs. 7, 8). Several (auditory and non-auditory) units with irregular discharge were excited during a basilar membrane displacement towards scala vestibuli whereas a basilar membrane motion towards scala tympani resulted in a decrease of the discharge rate. A few units showed a different reaction. The results provide evidence that the neurones with periodic spontaneous discharge innervate the lagena and that this sense organ has no auditory significance in birds. The peripheral origin of the ‘non-auditory’ neurones with irregular spontaneous activity remains undecided and might be the macula lagenae or the apical portion of the basilar papilla.

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Abbreviations

CF :

characteristic frequency

MEM :

middle-ear muscle

SPL :

sound pressure level

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  1. Horst Oeckinghaus

    Present address: Institut für Zoologie, Technische Universität München, Lichtenbergstraße 4, D-8046, Garching, FRG

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  1. Lehrstuhl für Allgemeine Zoologie, Ruhr-Universität Bochum, Federal Republic of Germany

    Horst Oeckinghaus

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Oeckinghaus, H. Modulation of activity in starling cochlear ganglion units by middle-ear muscle contractions, perilymph movements and lagena stimuli. J. Comp. Physiol. 157, 643–655 (1985). https://doi.org/10.1007/BF01351358

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