What is the order of development a fertilized egg in pregnant woman womb?
The order of development of a fertilized egg in a pregnant woman's womb (uterus) is as follows:
1. Fertilization: The process begins with fertilization, which occurs when a sperm cell from the man penetrates and fuses with an egg cell (ovum) from the woman. This usually takes place in one of the fallopian tubes.
2. Cell Division and Blastocyst Formation: After fertilization, the fertilized egg undergoes rapid cell division as it travels through the fallopian tube toward the uterus. This results in the formation of a hollow ball of cells called a blastocyst.
3. Implantation: The blastocyst reaches the uterus approximately five to six days after fertilization. It then undergoes a process called implantation, where it attaches to the lining of the uterus (endometrium).
4. Development of the Embryo: Over the next few weeks, the implanted blastocyst begins to develop into an embryo. The embryo differentiates into three layers: the ectoderm (which forms the skin, brain, and nervous system), the mesoderm (which forms muscles, bones, and other connective tissues), and the endoderm (which forms the digestive and respiratory systems).
5. Formation of the Placenta: The chorionic villi, which are specialized finger-like projections on the outer layer of the blastocyst, develop into the placenta. The placenta forms a connection between the mother's blood supply and the developing embryo, providing oxygen, nutrients, and removing waste products.
6. Organ Development: During the embryonic stage (weeks 3-8 of pregnancy), the major organs and body systems of the fetus begin to form. This includes the development of the heart, lungs, brain, limbs, and other essential structures.
7. Fetal Development: After the embryonic stage, the fetus continues to grow and develop over the remaining months of pregnancy (weeks 9-40). The fetus gradually matures and becomes fully formed, gaining weight and developing various physiological functions.
8. Birth: At the end of the pregnancy, when the fetus is fully developed and ready to be born, labor begins. The mother's uterine muscles contract, pushing the baby out through the vagina and into the outside world.
This sequence of events outlines the key stages of development of a fertilized egg in a pregnant woman's womb, leading to the birth of a baby.