What is the normal physiology of the menstrual cycle?
The normal menstrual cycle is a tightly coordinated cycle of stimulatory and inhibitory effects that results in the release of a single mature oocyte from a pool of hundreds of thousands of primordial oocytes.
What is menstrual cycle physiology?
Menstruation is the cyclic, orderly sloughing of the uterine lining, in response to the interactions of hormones produced by the hypothalamus, pituitary, and ovaries. The menstrual cycle may be divided into two phases: (1) follicular or proliferative phase, and (2) the luteal or secretory phase.
Why is it called menstruation?
When periods (menstruations) come regularly, this is called the menstrual cycle. Having regular menstrual cycles is a sign that important parts of your body are working normally. The menstrual cycle provides important body chemicals, called hormones, to keep you healthy.
What defines menstruation?
Menstruation is the monthly shedding of the lining of a woman’s uterus (more commonly known as the womb). Menstruation is also known by the terms menses, menstrual period, cycle or period.
Why is the menstrual cycle 28 days?
Charles Darwin thought that the 28-day human menstrual cycle was evidence that our ancestors lived on the seashore and needed to synchronise with the tides. The Moon’s phase certainly has an effect on the behaviour of many animals.
What’s the duration of a normal menstrual cycle?
1. Menstrual CycleBy Dr Nailla Memon 2. NORMAL MENSTRUAL CYCLEmean duration of the MC Mean 28 days (only 15% of ) Range 21-35average duration of menses 3-8 daysnormal estimated blood loss Approximately 30 mlovulation occur Usually day 14 36 hrs after the onset of mid-cycle LH surge 3.
When does the follicular phase of the menstrual cycle begin?
The median duration of a menstrual cycle is 28 days with most cycle lengths between 25 to 30 days. The menstrual cycle may be divided into two phases: (1) follicular or proliferative phase, and (2) the luteal or secretory phase. The follicular phase begins from the first day of menses until ovulation.
How is the frequency of the menstrual cycle regulated?
The cycle frequency is regulated by the hypothalamus-pituitary-gonadal participating directly in a feedback-regulated control of the cycle. 2 years from the menarche and during the perimenopausal transition. The ovarian cycle has is called the follicular or proliferative phase. The second, between ovulation and the next
How long is the luteal phase of the cycle?
The luteal phase of the cycle is relatively constant in all women, with a duration of 14 days. The variability of cycle length is usually derived from varying lengths of the follicular phase of the cycle, which can range from 10 to 16 days.