Final answer:
The isthmus is the section of the fallopian tubes that connects to the uterus. The fallopian tubes feature the infundibulum and fimbriae at the lateral ends near the ovaries and aid in guiding the egg towards the uterus, where fertilization typically occurs.
Step-by-step explanation:
The structure that connects to the uterus is the isthmus. It is the narrow medial end of each uterine tube that is connected to the uterus. The fallopian tubes or oviducts extend from the uterus up toward the ovaries. Although not directly attached to the ovaries, the fallopian tubes have lateral ends with a trumpet-like structure called the infundibulum, which ends in finger-like projections known as fimbriae. During ovulation, the fimbriae help guide the non-motile egg into the tube for passage to the uterus. The tube's ciliated walls and smooth muscle contractions move the egg toward the uterus, a journey that typically takes about a week. Fertilization usually takes place within the fallopian tubes before the embryo travels to the uterus for further development.