A fertilized egg goes through several stages of development but initially is called a zygote. The next stages of development are blastocyst, embryo and fetus.
It takes between three and five days for the zygote to traverse the fallopian tubes into the uterus, where it develops into a blastocyst. The blastocyst, little more than a congregation of cells, implants in the uterine wall, where the amniotic sac grows. The embryo stage follows where the body takes form and internal organs begin to develop. Eight weeks after fertilization, the embryo is developed enough to be considered a fetus. During this final stage, the bodily components that formed as an embryo continue to mature until delivery.Learn More
Egg cells are considerably larger than sperm cells because they carry the cytoplasm and organelles necessary for cell division and growth to begin, while sperm cells are basically a cell nucleus and a tail. Because the sole purpose of the sperm is to carry the father's genetic information to the egg cell so fertilization can occur, small size and superior motility are advantageous.Full Answer >
Symptoms of egg implantation in the uterine wall may include spotting, called implantation bleeding, and cramps, explains the American Pregnancy Association. However, a woman can fail to experience or notice these symptoms and still be pregnant. The symptoms may also have other causes, such as menstruation or an infection.Full Answer >
According to WebMD, during the first trimester of pregnancy, it is normal to experience discharge with an egg-white color containing a mild smell. This discharge is called leukorrhea. The body is responding to hormonal changes as a result of the pregnancy.Full Answer >
A zygote is the result of the union of an ovum (egg cell) and a sperm cell. It remains a zygote until it begins to divide; at that point, the zygote becomes an embryo.Full Answer >