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- W2026554103 abstract "Ultrastructural investigation of the γ-aminobutyric acid (GABA) component of the inner spiral bundle in adolescent mice revealed a pathway of glutamic acid decarboxylase (GAD)-positive and -negative fibers and vesiculated endings that contact inner hair cells and their afferents through a complex of axosomatic and axodendritic synapses. Ultrastructural details were investigated by using conventional electron microscopy. Several synaptic arrangements were observed: Main axosomatic synapses form between vesiculated endings and individual or adjoining inner hair cells (interreceptor synapses). Spinous synapses form on long, spinelike processes that protrude from inner hair cells to reach distant efferent endings. The efferent endings associate with inner hair cells and their synaptic afferents through compound synapses—serial, “converging,” and triadic—otherwise characteristic of sensory relay nuclei. Serial synapses form by the sequential presynaptic alignment of the efferent→receptor→afferent components. Converging synapses result from the simultaneous apposition of a receptor ribbon synapse and a presynaptic efferent terminal on a recipient afferent dendrite. Triadic synapses comprise a vesiculated efferent ending in contact with an inner hair cell and with its synaptic afferent. Additionally, efferent endings may form simple axodendritic and axoaxonal synapses with GAD-negative vesiculated endings. The combination of different synaptic arrangements leads to short chains of compound synapses. It is assumed that these synaptic patterns seen in the adolescent mouse represent adult synaptology. The patterns of synaptic connectivity suggest an integrative role for the GABA/GAD lateral efferent system, and imply its involvement in the pre- and postsynaptic modulation of auditory signals. J. Comp. Neurol. 377:423–442, 1997. © 1997 Wiley-Liss, Inc." @default.
- W2026554103 created "2016-06-24" @default.
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- W2026554103 date "1997-01-20" @default.
- W2026554103 modified "2023-10-18" @default.
- W2026554103 title "Compound synapses within the GABAergic innervation of the auditory inner hair cells in the adolescent mouse" @default.
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