The two ureters fused at the end and ran a course into the bladder, which had villi epithelium.The surface of the villi was a transitional epithelium.

• 左右输尿管在后端合并，稍微扩大，形成膀胱，膀胱内壁具有发达的绒毛，绒毛表面为变移上皮。