[The origin of the afferent innervation to the inferior colliculus in guinea pig. A horseradish peroxidase study (author's transl)].

The innervation of the inferior colliculus in guinea pig was studied using the method of retrograde axonal transport of horseradish peroxidase (HRP). Following injections of HRP into the central nucleus of the inferior colliculus (IC) HRP labeled cells were found in all auditory nuclei as well as in the temporal cortex. Virtually all neurons of the ventral nucleus of the lateral lemniscus and the medial superior olivary nucleus ipsilateral to the injection side appear to project to the IC. A large number of labeled cells exhibited in the dorsal nucleus of the lateral lemniscus and in the ventral and dorsal cochlear nuclei contralaterally. The lateral superior olivary nucleus was evenly labeled bilaterally while among the periolivary nuclei the dorsomedial periolivary nucleus was heavily labeled ipsilateral to the injection side. Furthermore, labeled neurons occurred in the contralateral IC and in the ventral part of the medial geniculate body on both sides. The pyramidal cells of layer V of the temporal cortex were heavily labeled ipsilaterally.