Abstract
Efferent olivocochlear neurons have been studied in the guinea pig both morphologically (Strutz and Spatz, 1980; Strutz and Beilenberg, 1984; Robertson, 1985) and electrophysiologically (Robertson, 1984; Robertson and Gummer, 1985). They originate in the lateral superior olive (LSO) ipsilateral to the injected cochlea and bilaterally in the dorsomedial periolivary region (DPMO), in the medial, ventral and lateral nuclei of the trapezoid body (MNTB, VNTB, LNTB) and in the vicinity of the ventral nucleus of the lateral lemniscus. Descending fibers are also known to project from the auditory cortex to the inferior colliculus (in guinea pig see Druga et al., this volume). The aim of our work was to investigate the origin and termination of fibers descending from the inferior colliculus (IC) in guinea pig. We were particularly interested in fibers projecting from the inferior colliculus to the superior olivary complex (SOC) because of possible contact with neurons projecting to the cochlea via the olivocochlear bundle.
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