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Menstrual cycle phases The menstrual cycle is divided into two phases: the follicular phase and the luteal phase. Within each phase, different things happen concurrently in the uterus and ovaries.
Between menarche and menopause the ovaries regularly alternate between luteal and follicular phases during the monthly menstrual cycle. [9] Stimulated by gradually increasing amounts of estrogen in the follicular phase, discharges of blood flow stop and the uterine lining thickens. Follicles in the ovary begin developing under the influence of ...
The follicular phase (or proliferative phase) is the phase of the menstrual cycle during which the ovarian follicles mature. The follicular phase lasts from the beginning of menstruation to the start of ovulation. [12] [13] For ovulation to be successful, the ovum must be supported by the corona radiata and cumulus oophorous granulosa cells. [14]
At the end of the luteal phase, progesterone levels fall and the corpus luteum atrophies. The drop in progesterone leads to endometrial ischemia which will subsequently shed in the beginning of the next cycle at the start of menses. [1] This last stage in the luteal or secretory phase may be called the ischemic phase and lasts just for one or ...
A woman’s monthly cycle has four parts: menstrual, follicular, ovulation and luteal phases. The ovaries make eggs, and the area around the developing egg is called the follicle.
Figure 2. Follicular phase diagram of hormones and their origins. Follicle-stimulating hormone (FSH) is secreted by the anterior pituitary gland (Figure 2). FSH secretion begins to rise in the last few days of the previous menstrual cycle, [3] and is the highest and most important during the first week of the follicular phase [4] (Figure 1).
At birth, meiosis arrests at the diplotene phase of prophase I. [7] Oocytes will remain in this state until the time of puberty. At the time of ovulation a surge of LH initiates the resumption of meiosis and oocytes enter the second cycle, which is known as oocyte maturation. Meiosis is then arrested again during metaphase 2 until fertilisation ...
One of the four stages of a monthly menstrual cycle, the luteal phase is often glossed over in the lay person’s understanding of fertility and hormone health, coming just as it does after the ...