Fertilization site of the egg

Nowadays, most couples have received higher education, so on the one hand they have mutual interests, on the other hand they have similar education, and have a certain understanding of sperm and egg. So, how long does it take for sperm and egg to fuse, and where does the sperm and egg fusion occur?

Where is the location of sperm and egg fusion?

The sperm and egg meet in the bilateral fallopian tubes and then migrate to the uterus.

Human sperm and egg meet and fuse in the fallopian tubes to form sperm-egg fusion, and then the sperm-egg fusion begins to grow into the initial test tube embryo. At this time, the nutrients for growth come from the yolk. When the test tube embryo arrives at the uterus, the embryo implants (which is what we often call pregnancy). From then on, the nutrients exchanged through the embryo come from the pregnant mother, and the metabolic waste is excreted by the pregnant mother. After two weeks of pregnancy, the test tube embryo is called a fetus. The pregnant mother is pregnant for about 280 days (40 weeks), and the fetus is fully developed. The complete fetus is produced from the process of vaginal delivery of the pregnant mother into labor. The completion of labor means the birth of the baby. Therefore, the location of sperm-egg fusion is the fallopian tubes.

(1) Insemination

The sperm produced by the male testicles are male somatic cells, and the eggs produced by the uterus and ovaries are female somatic cells.

After the egg is released from the uterus and ovaries, it enters the fallopian tubes on both sides. The semen containing sperm enters the vagina, and the sperm, with the help of its own movement, can pass through the uterus and reach the fallopian tubes. At this time, if the sperm and egg meet, fertilization can occur. The whole process of the close combination of male sperm and egg is called fertilization. In the fusion of sperm and egg, only one can enter the egg and combine with the egg nucleus to produce sperm and egg fusion. Other sperm gradually shrink and dissolve.

Reproductive process

1. Pregnancy

The combination of sperm and egg continues to carry out cell division and slowly grows into a blastocyst. The blastocyst slowly moves into the uterus and finally implants into the uterine wall, just like a seed falling into the soil. That's pregnancy.

2. Embryonic development

After the egg is fertilized, it begins to break down and divide to form a blastocyst. The first cell mass produced is the morula, which then produces an embryo and embeds itself in the uterine wall, absorbing nutrients from the pregnant mother and continuing to grow.

After two months of growth and development, the test tube embryo reaches 22mm in length and has begun to take on a human shape in appearance. Therefore, a test tube embryo around the 8th week is called a fetus, and the embryonic development process from this point on can also be called fetal development.

3. Nutritional composition of test tube embryos

The test tube embryo grows and develops in the pregnant mother's uterus, obtaining the necessary nutrients and CO2 from the pregnant mother through the embryo and the fetal umbilical cord; and waste products such as carbon dioxide produced by the fetus. It is also based on the embryo being expelled by the pregnant mother.