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- W2084686265 abstract "The migration, differentiation, and subsequent fate of the principal neurons of the tangential nucleus have been studied in the absence of the colossal fibers of the vestibular nerve in the chick embryo. Normally, the colossal fibers form large axosomatic synapses on the principal cells by means of the highly specific spoon endings. In this study the development of the vestibular nerve was prevented by unilateral otocyst ablations in 2-day old embryos, which were allowed to survive for varying lengths of time up to 13 days of incubation. At each developmental stage, the principal cells of the tangential nucleus on the operated side were compared with those on the unoperated sides and with those found in normal embryos in both rapid Golgi and reduced silver preparations. In the absence of vestibular input, principal cell neuroblasts can migrate and begin to differentiate up to the time when colossal fibers in the tangential nucleus would usually start to form swellings. Thereafter, the partly differentiated principal cells degenerate. Evidently, migration and the initial differentiation of the axon, cell body, and dendrites do not depend on the primary afferent axons, whereas completion of differentiation, continuation of growth, and cell survival do. The role of non-vestibular inputs in the development of the tangential nucleus remains uncertain. Nevertheless, it is clear that formation of many of the morphological features that distinguish principal cells as a distinct neuronal type does not depend on trophic influences or synaptic activity of the vestibular afferent fibers. These fibers, however, apparently do exert trophic effects on the later stages of neuronal development. Some of these effects must precede the formation of structurally defined synapses by the spoon endings." @default.
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- W2084686265 date "1977-04-01" @default.
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- W2084686265 title "Neurogenesis in the nucleus vestibularis tangentialis of the chick embryo in the absence of the primary afferent fibers" @default.
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- W2084686265 doi "https://doi.org/10.1016/0306-4522(77)90092-6" @default.
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