Uterous

The uterus has three major functions: to prepare a bed for a fertilized ovum, to nourish the developing embryo during pregnancy, and to expel the fetus. Shaped like an upside-down pear, and tilted forwards, it lies within the pelvis and is held in place, along with its two extensions, the Fallopian tubes, by ligaments and folds of the peritoneum. The cervix forms the lower third, connected by a narrow isthmus to the main muscular body of the uterus. The non-pregnant uterus weighs 45–60 g and is 7–8 cm long but its weight increases more than ten-fold by the end of pregnancy.

Uterine involution

The process by which the uterus returns to its normal pre-pregnant state (both anatomically and functionally) following childbirth or postpartum period. Normally, after childbirth, the enlarged uterus from pregnancy returns to its normal pre-pregnant size and state. However, there are certain conditions in which the involution of the uterus becomes abnormal such as in the cases of subinvolution and superinvolution.