Which structure is responsible for housing the developing fetus?

The uterus is the structure responsible for housing the developing fetus. It is a muscular organ located in the pelvic cavity of females and serves as the site where a fertilized egg implants and develops throughout the stages of pregnancy. The lining of the uterus, known as the endometrium, thickens in preparation for pregnancy and provides the necessary environment for the fetus to grow, as well as supplying nutrients and oxygen via the placenta once it is formed.

During gestation, the uterus expands significantly to accommodate the growing fetus and plays a crucial role in supporting the pregnancy until the point of delivery. Other structures, such as the placenta, serve supportive functions but do not house the fetus directly. The vagina is part of the birth canal and the cervix serves as the lower part of the uterus, playing a role in protecting the uterus during pregnancy and allowing passage during childbirth.