Distribution of cochlear efferents and olivo-collicular neurons in the brainstem of rat and guinea pig |
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Authors: | A. Aschoff J. Ostwald |
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Affiliation: | (1) Department of Zoophysiology, University of Tübingen, Auf der Morgenstelle 28, D-7400 Tübingen, Germany;(2) Present address: Max-Planck-Institute for Psychiatry, Kraepelinstrasse 2, D-8000 München 40, Germany |
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Abstract: | Summary In rat and guinea pig, cochlear efferents to the two ears were labeled simultaneously with different fluorescent tracers. It was found that in both species only few (1–3%) olivo-cochlear neurons were double-labeled and project to both cochleae. In most periolivary regions large olivocochlear neurons (OCN) projecting to the ipsilateral and contralateral side are intermingled and form a continuous cell column between the facial nucleus and lateral lemniscus. In a second series of experiments in rat, cochlear efferents and ascending olivo-collicular neurons were labeled. Olivo-cochlear and olivo-collicular neurons are intermingled in the lateral superior olive (LSO) and in the ventromedial periolivary region. No double-labeled neurons were found that project to the cochlea and the inferior colliculus. |
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Keywords: | Superior olive Cochlear efferents Inferior colliculus Fluorescent tracers Rodents |
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