Fallopian tube
The uterus opens into the Fallopian tube at the proximal tubal opening (also called the proximal ostium or os), after the uterotubal junction, and accessible via hysteroscopy. Occlusion at this opening is referred to as proximal tubal occlusion. From there there are three named parts of the Fallopian tube; the "isthmus", the "ampulla", and the "infundibulum". The "isthmus" sits next to the opening of the Fallopian tube into the uterus. It connects to the ampulla (), which curves over the ovary and is the most common site of human fertilization.