Fetal Development Essay

2441 words - 10 pages

Fetal DevelopmentMugs BlankAnatomy/PhysiologyOctober 1, 2001Mr. GoingFetal development starts with the process of fertilization. It starts when the female ovulates producing an egg. This egg then travels into the fallopian tube where it waits to be fertilized. Once sperm enter the body they must travel up the uterus until they make their way up to the egg.Once at the egg the sperm try to get in. They sperm wiggle their tails until they make it in. Once it makes it in the egg will not any other sperm in. The sperm that made it then drops its tail. After about twenty hours inside the egg the sperm finds the nucleus of the egg and fuses with it. Now the egg has all the genetic material that it needs to make a new human being.It now begins to move down into the uterus. The egg is now called a blastocyst. The time that this takes is often measured after the last menstrual period (LMP). The time is also measured in trimesters, three month intervals. After about thirty hours the cell divides for the first time. It is continuously moving towards the uterus where it will call home for the next nine months. After about two days it has divided to having about eight cells. After four days it is in the uterus and has to "land" somewhere and attach itself to the endometrium.The eighth day is when implantation occurs. The fertilized egg then implants itself on the endometrium, the uterine lining, and begins to grow. The cell begins to grow and develop. By the 12th day the blastocyst has approximately two thousand cells in it. It has had time to attach itself to the endometrium and these anchors are called protuberances.After about three weeks the tiny little heart is developed enough to start beating and has the ability to pump blood. At this time the blastocysts becomes an embryo. There are three layers that form the embryo. These layers are called the germ or cell layers. The outer cell layer will eventually become the backbone, the brain, and the nerves. This layer also makes the skin, the hair, and sebaceous and sweat glands.The middle layer is going to be the lower layer of skin, the bones, and the muscles. Blood and lymph vessels are also made from this layer. Blood cells and the heart muscles make a bloodstream. The sex organs and the kidneys also come from this layer.The inner layer makes up a simple intestinal tube with a mucus membrane. From that tube the lungs and urinary tract form. Everything from all the layers come together to form the organ system. Then the embryo can do a test run with the system. This happens every day while the organs are being formed.At around four weeks from the LMP the embryo begins to form a backbone. The bones are split in two, half on each side. The nerves begin to form down the middle of the bone pieces. The placenta is by now drawing nutrients from the mother. The nutrients then go down the umbilical cord into the embryo. The wastes then go into the mother where they are discarded.After about five weeks from the LMP...

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