2•Prototheria (monotremes)Metatheria (marsupials = pouched animals)Metatheria (marsupials pouched animals)Eutheria (placentals)•Hormones of gonadal axis:GnRH, GnIH(?)LH, FSHestrogens, 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
3Embryogenesis 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 kidneyFig 10-2= primary sex cordsdegeneratesvas deferensoviduct and uterus= secondary sex cordsdegenerates
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