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Mammalian%20reproduction[1] - The endocrinology of...

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1 The endocrinology of mammalian reproduction I. General features of mammalian reproduction
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2 Prototheria (monotremes) Metatheria (marsupials = pouched animals) Metatheria (marsupials pouched animals) Eutheria (placentals) Hormones of gonadal axis: GnRH, GnIH(?) LH, FSH estrogens, androgens, progestogens Gonadal axis is influenced by other axes, especially the HPT axis and HPA axis • FSH: gametogenesis • LH: steroidogenesis, release of gametes Gonadal steroids: primary and secondary sexual characters
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3 Embryogenesis of the gonads • Paired gonadal primordia arise from the Paired gonadal primordia arise from the intermediate mesoderm Consist of outer cortex and inner medulla Germ cells migrate from yolk sac endoderm to gonadal primordium Ducts arise from the transitory mesonephros kidney Fig 10-2 = primary sex cords degenerates vas deferens oviduct and uterus = secondary sex cords degenerates
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