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Journal of Neuroscience, Vol 11, 2063-2074, Copyright © 1991 by Society for Neuroscience
The development of afferent projections to the robust archistriatal nucleus in male zebra finches: a quantitative electron microscopic study
K Herrmann and AP Arnold
Department of Psychology, University of California, Los Angeles 90024- 1563.
Because the projections into the robust nucleus of the archistriatum (RA)
are thought to play important roles in song learning and sexual
differentiation of the zebra finch (Poephila guttata), quantitative
electron microscopic techniques were used to measure the development of
synaptic input to the neuropil of RA in this species. Two nuclei
[hyperstriatum ventrale pars caudalis (HVc) and lateral magnocellular
nucleus of the anterior neostriatum (IMAN)] that send projections to RA
were lesioned at each of three different ages: 25 d after hatching, 53 d,
and adulthood. In tissue from RA processed for conventional electron
microscopy, lesion-induced degeneration was used to identify synapses from
either HVc or IMAN. Axosomatic synapses were excluded from analysis. In
control (unlesioned) animals, the density of synapses in neuropil increased
slightly between days 28 and 56 and remained constant thereafter. Because
of a large increase in the volume of RA, the total number of synapses in
neuropil of RA tripled between days 28 and 56 and decreased significantly
between day 56 and adulthood. The density and total number of synapses in
neuropil originating from HVc increased significantly between days 25 and
53, but did not change significantly thereafter. In contrast, the density
and total number of synapses from IMAN decreased significantly between days
25 and 53 and did not change thereafter. Presynaptic terminals from IMAN
were larger than those from HVc. These data demonstrate that the most rapid
phase of song learning is accompanied by a major rearrangement of synaptic
contacts into RA that stem from HVc and IMAN.
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