UTERUS
There is many changes occur in uterus during pregnancy such as in non pregnant uterus weight is 50 gms and during pregnancy it increases to 1000 gms. The valume of uterine cavity increases to around 5 liters. The muscle fibers of uterus undergoes to hyperplasia and hypertrophy and there is stretching of muscle fibres. The isthmus of uterus form the lower uterine segment after 12 weeks of pregnancy which dilate during last trimester 7.5 to 10 cm