Hello fellow veterans, I believe many people do not know much about the formation process of egg cells. Therefore, today I will share with you about the formation process of egg cells and eggs. I hope this knowledge can help you solve some of your confusions. Let’s take a look below!
Contents of this article
- Oogonia production period
- Why does the egg cell not deform during its formation
- How is the egg produced
- Egg formation
1. Oogonia production period
1. After sexual maturity, follicles begin to develop from oocytes every one month, and it usually takes 7-14 days to mature. or so time.
2. The cells just produced by the ovary are called egg cells. After development, they are called eggs. Eggs are matured from egg cells. Eggs and egg cells are Two stages of germ cell development. Mature eggs are female reproductive cells, also called follicles. The follicles that have been present in the ovary since the embryonic period are called cornerstone follicles. The follicles that are truly mature and have reproductive functions only appear after the development of female secondary sexual characteristics. Start developing. Prior to this, even if most of the follicles are atretic, oocytes will develop every month from the stage of sexual maturity after menarche. After about 7-14 days, the follicles will mature and rupture to cause ovulation. Each woman\’s menstrual cycle and duration of menstruation are different, so the time for follicles to mature will also be different. Generally, they start to develop after the end of menstruation, when the follicles grow to be larger than about 18-25mm. It is a mature follicle. Under the influence of hormones and the surface tension of the ovary, the mature follicle ruptures and releases the egg. The survival time of the released egg is 24-48 hours. The best time for insemination is 6-24 hours after ovulation. Then if a fertilized egg is not formed for more than 48 hours, the egg will naturally undergo apoptosis.
2. Why does the egg cell not deform during its formation
1. Cytoplasmic division. During the formation of sperm cells, the cytoplasmic divisions of minus one and minus two in the later stages are equal, while the corresponding two cytoplasmic divisions during the formation of egg cells areUnequally.
2. The number of mature germ cells formed is different. A spermatogonia undergoes reduction division to form two secondary spermatocytes, which then undergo reduction division to form a total of four sperm cells; while an oogonia undergoes reduction division to form a secondary oocyte and a polar body. , and then subtract two to form an egg cell and three polar bodies (the polar bodies will later degenerate and disappear).
3. Sperm cells must undergo deformation to form sperm, and egg cells do not need to deform
3. How eggs are produced
Eggs are produced by what we usually call the female gonads – ovaries. Eggs are the largest cells in the human body. The main function of the ovaries, in addition to secreting essential female sex hormones, is to produce eggs. The embryonic form of ovaries is already formed in girls at about 3 to 6 weeks of gestation. Before birth, millions of oocytes have been formed in the ovary. After childhood and adolescence, only more than 100,000 oocytes remain in adulthood.
4. The formation of eggs
Egg cells are composed of what we usually call The female gonads – produced by the ovaries – are about 0.2mm in diameter. The main function of the ovaries, in addition to secreting essential female sex hormones, is to produce eggs. The rudimentary form of the ovaries is already formed in girls during the embryonic period, which is about 3 to 6 weeks of gestation. Before birth, millions of oocytes have been formed in the ovary. After childhood and adolescence, only more than 100,000 oocytes remain in adulthood.
Oocytes are wrapped in primordial follicles. Under the influence of sex hormones, only one primordial follicle matures every month, and the mature eggs are discharged from the ovary into the abdominal cavity. Generally speaking, a woman will have about 300 to 400 mature eggs in her lifetime, and the rest of the oocytes will fend for themselves.
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