2)输尿管芽→反复分支→集合小管、肾 盏、肾盂、输尿管 Collecting tubules Outgrowing collecting tubules Major calyx Metanephric blastema∩ 2 Pelvis Minor calyx- UUt Ureter enal pelvis D2) 输尿管芽 → 反复分支→集合小管、肾 盏、肾盂、输尿管