Your uterus, fallopian tubes, and ovaries.
If there are any defects with these three major organs, then prolems with reproduction can arise. Yet, the incredible part is that they were developed, in you, at a very early embryonic stage, so there have been plenty of chances for something to go wrong. For example, the uterus and tubes in a female embryo develop in the 5th week after fertilization, at which point the embryo is only about 10 to 11 millimeters long. The uterus begins as two halves. After these two sections fuse together, the developing uterus begin to create a cavity that is finally completed by the time the fetus is 12 weeks old, the vagina opening, however, is not complete until the 6th month of pregnanchy.
During this early stage of embryonic development, the two halves of the uterus may fail to fuse together properly or fuse only partially, giving rise to anatomical problems. Similarly problems may arise in utero with the ovaries and the production of eggs. The cells that are going to form eggs appear in the female fetus approximately 3 weeks after conception! At 2 months, the female embryo has about 600,000 eggs. By 5 months, the embryo is storing nearly 7 million eggs. By the time the baby is born, that number will have dropped to 2 million and, by puberty, will have dropped even future to around 400,000.
Women only need a few hundred eggs for the released each cycle, but all women contain a huge store of eggs that slowly declines during their reproductive lives. From that surprisingly large figure of 400,000 at puberty, the number has dwindled down to 35,000 once you pass the age of thirty-five.
As far as is known, women do not form new eggs after birth, unlike the male who constantly manufactures fresh sperm on a daily basis. More than a billion sperm may be ejaculated in one act of intercourse, and they begin forming again almost immediately.
If there are any defects with these three major organs, then prolems with reproduction can arise. Yet, the incredible part is that they were developed, in you, at a very early embryonic stage, so there have been plenty of chances for something to go wrong. For example, the uterus and tubes in a female embryo develop in the 5th week after fertilization, at which point the embryo is only about 10 to 11 millimeters long. The uterus begins as two halves. After these two sections fuse together, the developing uterus begin to create a cavity that is finally completed by the time the fetus is 12 weeks old, the vagina opening, however, is not complete until the 6th month of pregnanchy.
During this early stage of embryonic development, the two halves of the uterus may fail to fuse together properly or fuse only partially, giving rise to anatomical problems. Similarly problems may arise in utero with the ovaries and the production of eggs. The cells that are going to form eggs appear in the female fetus approximately 3 weeks after conception! At 2 months, the female embryo has about 600,000 eggs. By 5 months, the embryo is storing nearly 7 million eggs. By the time the baby is born, that number will have dropped to 2 million and, by puberty, will have dropped even future to around 400,000.
Women only need a few hundred eggs for the released each cycle, but all women contain a huge store of eggs that slowly declines during their reproductive lives. From that surprisingly large figure of 400,000 at puberty, the number has dwindled down to 35,000 once you pass the age of thirty-five.
As far as is known, women do not form new eggs after birth, unlike the male who constantly manufactures fresh sperm on a daily basis. More than a billion sperm may be ejaculated in one act of intercourse, and they begin forming again almost immediately.
