title: Distribution of cochlear efferents and olivo-collicular neurons in the brainstem of rat and guinea pig. A double labeling study with fluorescent tracers.
abstract: 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.
authors.affiliation: Department of Zoophysiology, University of Tübingen, Federal Republic of Germany.
authors.forename: A
authors.initials: A
authors.lastname: Aschoff
authors.forename: J
authors.initials: J
authors.lastname: Ostwald
mesh_terms: D000578:Amidines; D000818:Animals; D001931:Brain Mapping; D002452:Cell Count; D003051:Cochlea / Q000033:anatomy & histology / Q000294:innervation*; D004525:Efferent Pathways / Q000033:anatomy & histology; D005456:Fluorescent Dyes; D006168:Guinea Pigs; D007245:Inferior Colliculi / Q000033:anatomy & histology*; D009847:Olivary Nucleus / Q000033:anatomy & histology*; D051381:Rats; D011919:Rats, Inbred Strains
chemical_list: D000578:Amidines; D005456:Fluorescent Dyes; C031455:diamidino compound 253-50; C037945:diamidino yellow