What is monthly female reproductive (menstruation) cycle?

Menstruation is the cyclic changes in the uterus and ovary. During this period, the ovary and uterus undergo a cycle of change every 28 days.  After ovulation if ovum is not fertilized the menstruation occurs. If ovum is fertilized the menstruation cycle stops till the birth of the child. The menstruation consists of the following stages:
(i)    Menstruation (3-7 days): During this period bleedings takes place and uterus lining, blood vessels shed off as blood and mucus.
(ii)    Ovulation: The ovary releases one ovum after 10-12 days of menstruation. During this period the uterine wall prepares itself to receive the ovum.
(iii)    The ovum reaches the Fallopian tube on the 14th day and waits up to 16th day for the sperm cell. If it does not meet the sperm it starts degenerating.
(iv)    At the end of the 28th day, this ovum is rejected alongwith the uterus lining i.e., menstruation occurs.