| During pregnancy, the muscular uterus becomes thin-walled and enlarges enough to accommodate the fetus, placenta, and amniotic fluid. The volume of the normal uterine cavity is 10 milliliters, but during pregnancy that volume increases to between 5 and 20 liters. The enlargement in size is due in part to stretching and also to hypertrophy of the muscle cells.
The bottom section of the uterus, called the cervix, becomes becomes soft and eventually thins out during pregnancy. [1] |