3.卯巢的发生(10周) 1)XX(noH-Y)→初级性索→退化、消失 2)体腔上皮→次级性索(含原始生殖细胞) Surface Degenerating pithelium mesonephric tubule Degenerating medullary cords Oogonium ∴ Cortical Follicular cords cells Ductuli efferentes Paramesonephric Mesonephric Surface duct epithelium Paramesonephric duct A Mesonephric duct HOME1) XX (no H-Y)→初级性索→退化、消失 2) 体腔上皮→次级性索 (含原始生殖细胞 ) 3.卵巢的发生（10周）