Menopause in women cannot however simply be defined as the permanent "stopping of the monthly periods", because in reality what is happening to the uterus is quite secondary to the process. For medical reasons, the uterus is sometimes surgically removed (hysterectomy) in a younger woman, and after this her periods will cease permanently and the woman will technically be infertile, but as long as her ovaries (or one ovary) are, or is, still functioning, the woman will not be in menopause. This is because even without the uterus, ovulation, and the release of the sequence of reproductive hormones that are an essential part of the reproductive cycles, will continue until the time of menopause is reached.
Menopause
is in fact triggered by the faltering and shutting down (or surgical removal)
of the ovaries, which are a part of the body's endocrine system of hormone production,
in this case the hormones which make reproduction possible and influence sexual
behavior.The process
of the ovaries shutting down is a phenomenon which involves the entire cascade
of a woman's reproductive functioning, from brain to skin, and this major physiological
event usually has some effect on almost every aspect of a woman's body and life.(1)
source
: wikipedia