Abstract:
:The superior olivary complex (SOC) is part of the auditory brainstem of the vertebrate brain. Residing ventrally in the rhombencephalon, it receives sensory signals from both cochleae through multisynaptic pathways. Neurons of the SOC are also a target of bilateral descending projections. Ascending and descending efferents of the SOC affect the processing of auditory signals on both sides of the brainstem and in both organs of Corti. The pattern of connectivity indicates that the SOC fulfills functions of binaural signal integration serving sound localization. But whereas many of these connectional features are shared with the inferior colliculus (with the important exception of a projection to the inner ear), cellular and molecular investigations have shown that cells residing in SOC are unique in several respects. Unlike those of other auditory brainstem nuclei, they specifically express molecules known to be involved in development, plasticity, and learning (e.g., GAP-43 mRNA, specific subunits of integrin). Moreover, neurons of the SOC in adult mammals respond to various kinds of hearing impairment with the expression of plasticity-related substances (e.g., GAP-43, c-Jun, c-Fos, cytoskeletal elements), indicative of a restructuring of auditory connectivity. These observations suggest that the SOC is pivotal in the developmental and adaptive tuning of binaural processing in young and adult vertebrates.
journal_name
Microsc Res Techjournal_title
Microscopy research and techniqueauthors
Illing RB,Kraus KS,Michler SAdoi
10.1002/1097-0029(20001115)51:4<364::AID-JEMT6>3.0keywords:
subject
Has Abstractpub_date
2000-11-15 00:00:00pages
364-81issue
4eissn
1059-910Xissn
1097-0029pii
10.1002/1097-0029(20001115)51:4<364::AID-JEMT6>3.0journal_volume
51pub_type
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