Follicular phase
Phase of the estrous or menstrual cycle
Follicular phase
The follicular phase, also known as the preovulatory phase is the phase in the ovarian cycle concurrent with the proliferative phase of the uterine cycle. It is the phase in the ovarian cycle of the menstrual cycle during which primordial follicles in the ovary develop to primary follicles, and secondary follicles to a fully mature antral follicle (Graafian follicle), containing a mature egg cell. The follicular phase ends with ovulation. The main hormones controlling this stage are gonadotropin-releasing hormones, follicle-stimulating hormones and luteinising hormones released by pulsatile secretion. The duration of the follicular phase can differ depending on the length of the menstrual cycle while the luteal phase typically lasts around 14 days.
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