Hormones, Egg & Fertilization Timing

How long the egg survives after ovulation

How long the egg survives after ovulation

What happens when the egg is released Ovulation is the release of a mature egg from the ovary into the fallopian tube, where fertilization can occur if sperm are already present or arrive soon afterward. From a biological standpoint, the egg is designed for a very short life outside the ovary. Once released, it begins […]

Progesterone changes after ovulation

Progesterone changes after ovulation

What changes right after ovulation Ovulation marks a major transition in hormone physiology. Before ovulation, the dominant goal is to mature a follicle and prepare an egg for release. The luteinizing hormone surge triggers that release, and then the follicle does not simply disappear. It reorganizes into the corpus luteum, which becomes the main source […]

LH surge and its role in ovulation

LH surge and its role in ovulation

What the LH surge is LH is made by the pituitary gland and works as part of the hypothalamic-pituitary-gonadal axis. During the first half of the menstrual cycle, follicle-stimulating hormone supports follicle growth in the ovary, while the developing follicle produces increasing estradiol. Once estrogen reaches a sustained threshold, the feedback effect reverses from mostly […]

What happens after ovulation: egg lifespan, fertilization limits, and biological timing

What happens after ovulation: egg lifespan, fertilization limits, and biological timing

The first hours after ovulation is the release of a mature oocyte, commonly called an egg, from a dominant ovarian follicle. Once released, the egg does not simply drift randomly through the pelvis. The fimbriae, finger-like projections at the end of the fallopian tube, help sweep the egg toward the tubal opening. Ciliary movement, tubal […]

Hormones in ovulation: LH surge, estrogen, progesterone, and fertile window timing

Hormones in ovulation: LH surge, estrogen, progesterone, and fertile window timing

The menstrual cycle as a coordinated endocrine system The ovulatory menstrual cycle is usually described in phases: follicular, ovulatory, and luteal. Underneath those labels is a dynamic feedback system involving the hypothalamus, pituitary gland, ovaries, endometrium, cervix, and fallopian tubes. The hypothalamus releases gonadotropin-releasing hormone in pulses, which stimulates the pituitary to secrete follicle-stimulating hormone […]