Ureter anatomy is really important, at least enough so to look up in an atlas for 5-10 minutes. They are retroperitoneal. They can be damaged during ligation of both the ovarian and uterine arteries.
There are three constrictions along the ureter: UPJ, where they cross over the external iliacs, and UVJ. From someone who has taken the exam, these are worth knowing. Should probably also know the spinal level of the second constriction.