How Pregnancy Happens - Teen Health Source
This egg leaves the ovarian follicle and is 'captured' in the end of the Fallopian it must first meet sperm from the male whilst it is still held in the Fallopian tube. For a conception an egg cell and many sperm are needed. When the Such great numbers are necessary because most sperm do not reach the ovum. Also, for. Fertilization: Sperm meets egg. The mature egg is fertilized when it is joined with a sperm cell. This usually happens after a penis* has ejaculated semen inside.
How Pregnancy Happens
Now, where do eggs and sperm come from, and how do they develop? Egg cells ovum The egg is among the largest cells in the female body — 0.
Maturation of eggs occurs during puberty, when you begin your menstrual cycle. At that point, your ovaries can develop and release a mature egg, an ovum, through a process each month called ovulation. Each egg that is released is capable of being fertilized by sperm in the fallopian tube. Where are all these eggs vanishing to? Every egg within your ovaries is enclosed within an ovarian follicle, which is a sac of cells that surround each egg.
These follicle cells help to prepare an egg for ovulation and conception, by responding to and producing hormones. By the time you begin menstruation your follicle count is around1.
Only around follicles will release an egg through ovulation in your reproductive lifetime 1. Every month, one lucky egg fully develops and is set out for potential fertilization, but the others that are not selected for ovulation will undergo programmed cell death follicular atresia and be reabsorbed — about to expired eggs per month 1.
What is sperm? And what are human eggs?
Sperm Unlike the egg, sperm are among the smallest cells in the male body. Sperm is meticulously, and continuously, created for the intent of fertilizing an egg 2.Fertilization
At the onset of puberty, immature reproductive cells called spermatogonia go through the process of spermatogenesis, where they begin to multiply quickly and continue to divide and divide to eventually develop mature sperm, spermatozoa 2. The sperm maturation process occurs in long tight tubes in the testes called seminiferous tubules. On average, only a few of the billions of sperm released during the reproductive life of a human male will manage to fertilize an egg 2.
- The ovum and sperm
- Sex cells 101
- Fertility basics
The fertilized egg attaches to the lining of the uterus and pregnancy begins. Most eggs are fertilized by sperm while still in the fallopian tube. The fertilized egg then travels down the fallopian tube into the uterus. This can take days. When the egg reaches the uterus, it may attach itself to the uterine lining the endometrium and pregnancy will begin.
Many fertilized eggs are never implanted and are flushed out of the body with the next period. How do I know when ovulation happens? The best way to tell when ovulation takes place is to use a fertility awareness method FAM.
Fertility Basics - Complete Fertility Centre Southampton
If you are not using FAM, it can be hard to tell when you ovulate. To learn more about FAM, check out our info page [ Link ].
Around day 4 to 6 after fertilisation the blastocyst stage of the embryo begins. Fluid starts to fill inside the embryo making a small cavity. The outer cells begin to form a wall and the inner cells form a ball - this will become the future baby. Implantation All this time the embryo has been rolling down the Fallopian tube, but at the blastocyst stage the embryo enters the womb.
Over the next few days it will hatch out of its shell and begin to bury into the wall of the womb. It will grow and eventually form blood vessel connections with the mother. The embryo must then continue to grow and develop the different types of cells and structures necessary to become a baby.