What is the name of the structure in females where the fetus develops?

The name of the structure in females where the fetus develops is the uterus. This muscular organ is located in the pelvis and plays a crucial role in reproduction. After fertilization occurs, the fertilized egg implants itself into the lining of the uterus, where it can then grow and develop throughout the pregnancy. The uterus provides the necessary environment for fetal development, including nutrients and protection, and is able to accommodate the growing fetus as it matures.

The other structures listed do not serve this purpose. The Fallopian tubes are responsible for transporting the egg from the ovaries to the uterus and are also the site where fertilization typically occurs, but they do not support fetal development. The ovaries are responsible for producing eggs and hormones but do not house the developing fetus. The vagina is the canal leading to the uterus and serves as the birth canal during delivery, but it is not involved in the development of the fetus itself.