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- W2000643725 abstract "The lateral olivocochlear efferent pathway terminates in vesicle-filled swellings in the inner spiral bundles under inner hair cells (IHCs) and has been suggested to include at least two chemically distinct subclasses (see, e.g., Vetter et al. [1991] Synapse 7:21–43). In the present study, the ultrastructure and peripheral targets of vesicle-filled swellings in the IHC area of the cat and guinea pig cochleas were quantitatively analyzed to determine 1) whether morphological subclasses could be defined based on swelling size or on the density, size, or shape of clear and dense-cored vesicles and 2) whether swellings with different postsynaptic targets differed morphologically. In both cat and guinea pig, all swellings contained large, round, clear vesicles and a variable number of dense-core vesicles. Although evidence of clear-cut subclasses was not compelling, the smallest swellings tended to be rich in dense-core and poor in clear vesicles and rarely formed synaptic contacts. Most of the larger swellings, which tended to contain few dense-core vesicles and a rich complement of clear round vesicles, formed synapses with radial afferent fibers. However, there were no morphological differences between swellings contacting afferents originating on the modiolar vs. pillar sides of the IHC (the source of afferents with low and high spontaneous discharge rates, respectively). We conclude that 1) if distinct γ-amino butyric acid (GABA)ergic and cholinergic subclasses of lateral olivocochlear (LOC) fibers exist, then the vesicle morphology of their terminals does not differ as it does in the central nervous system and that 2) if peptide neurotransmitters, such as calcitonin gene-related peptide and enkephalins, are packaged in dense-core vesicles, then the LOC terminals synapsing with IHC afferent fibers are not particularly rich in these peptides. © 1996 Wiley-Liss, Inc." @default.
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- W2000643725 date "1996-08-05" @default.
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- W2000643725 title "Morphological subclasses of lateral olivocochlear terminals? Ultrastructural analysis of inner spiral bundle in cat and guinea pig" @default.
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- W2000643725 doi "https://doi.org/10.1002/(sici)1096-9861(19960805)371:4<621::aid-cne10>3.0.co;2-m" @default.
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