What ensures the stability of the fetus during development?

The amniotic sac plays a crucial role in ensuring the stability of the fetus during development. It is a fluid-filled structure that envelops the fetus, providing a protective environment. The amniotic fluid within this sac cushions the fetus, reducing the risk of injury from external forces and allowing for a degree of movement, which is essential for musculoskeletal development. Additionally, the fluid helps to maintain a constant temperature and provides a sterile environment, which protects the developing fetus from infections. This supportive environment is vital for proper growth and development throughout gestation.

The placenta is primarily responsible for nutrient and gas exchange between the mother and fetus, while the umbilical cord serves as a conduit for these exchanges but does not provide the same level of physical stability. The ovary is involved in the reproductive process but does not play a direct role in stabilizing the fetus after conception.