Androgens and estrogens induce seasonal-like growth of song nuclei in the adult songbird brain.

@article{Tramontin2003AndrogensAE,
  title={Androgens and estrogens induce seasonal-like growth of song nuclei in the adult songbird brain.},
  author={Anthony D. Tramontin and John C Wingfield and Eliot A Brenowitz},
  journal={Journal of neurobiology},
  year={2003},
  volume={57 2},
  pages={130-40}
}
In seasonally breeding songbirds, the brain regions that control song behavior undergo dramatic structural changes at the onset of each annual breeding season. As spring approaches and days get longer, gonadal testosterone (T) secretion increases and triggers the growth of several song control nuclei. T can be converted to androgenic and estrogenic metabolites by enzymes expressed in the brain. This opens the possibility that the effects of T may be mediated via the androgen receptor, the… CONTINUE READING

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