Keywords Sperm injections;intracytoplasmic;Oocyte;Gonadotropins;Clinical outcome;Perivitelline space granularity;Granular cytoplasm;

• 单精子注射;细胞质内;卵母细胞;促性腺激素类;临床结局;卵周隙内颗粒;胞浆粗颗粒;