[Early auditory evoked potentials (EAEP) following cochlear nerve lesions in the cerebellopontile angle. An animal experiment study].

After exposure of the cerebello-pontine angle, various lesions were applied to the cochlear nerve in 20 rabbits. Changes of the EAEP were registered at the same time. Lesions proximal to the internal auditory meatus hardly exercised any influence on wave I. Waves II-V disappeared immediately after the trauma, Partial or complete recovery was observed, depending on the extension of the nerve lesion. Dissection or crushing of the cochlear nerve resulted in permanent disappearance of the waves II-V. Wave I often showed a slight reduction of amplitude, combined with a broadening of its duration and increase in latency. Lesions of minor intensity produced a transient disappearance of waves II-V. Recovery of these waves occurred within the following 2-3 days.