Sexual Differentiation of the Zebra Finch Song System

Annals of the New York Academy of Sciences - Tập 1016 Số 1 - Trang 540-559 - 2004
Juli Wade1, Arthur P. Arnold2
1Departments of Psychology and Zoology, and Program in Neuroscience, Michigan State University, East Lansing, Michigan 48824‐1101, USA
2Department of Physiological Science, and Laboratory of Neuroendocrinology of the Brain Research Institute, University of California, Los Angeles, California 90095‐1606, USA

Tóm tắt

Abstract: The song system of zebra finches (Taeniopygia gutatta) is highly sexually dimorphic. Only males sing, and the brain regions and muscles controlling song are much larger in males than in females. Development of the song system is highly sensitive to steroid hormones. However, unlike similar sexually dimorphic systems in other animal models, masculinization of song system structure and function is most likely not induced by testosterone secreted from the testes. Instead, sex‐specific development of the neural song system appears to be regulated by factors intrinsic to the brain, probably by the expression of sex chromosome gene(s) that influence the levels of estradiol synthesized in the brain and/or the responses of brain tissue to estradiol. However, the existing data are complex and in some cases contradictory. More work is required to identify the critical genes and their relationships with steroid hormones.

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Annals of the New York Academy of Sciences

Tập 1016 Số 1

540-559

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