Later the zygote becomes a blastocyst. An abnormally slow growth rate results in the infant being , and, on the other hand, an abnormally large growth rate results in the infant being. It is no wonder that the stages of prenatal development pregnancy seem to be interesting for women. During the final seven months before birth, all the organs continue to develop. Ectoderm which will become the skin and nervous system.
Unfortunately, prenatal damage caused by such as alcohol, cocaine, , inhalants, and are still far too common. The first two weeks from fertilization is also referred to as the germinal stage or preembryonic stage. Prenatal Development -- the process in which a baby develops from a single cell after conception into an embryo and later a fetus. Implantation , the attachment of the zygote to the uterine wall, takes place about 11 to 15 days after conception. During the third month of gestation, the sex organs begin to differentiate and by the end of the month, all parts of the body will be formed. It implants in the lining in order to transport nutrients from the mother's blood supply to the fetus. Steve and Jennifer worked hard to get everything ready for the arrival of their new child.
The fetus quickly grows as bones and muscles form, and it begins to move inside the uterus. Conception is also the beginning of the germinal period of prenatal development. The blastocyst that implanted in the uterus continues to divide rapidly after implantation. All of the essential structures have been formed both inside and outside by the time the embryonic period comes to an end. In other cases, problems may arise when a fetus is born prematurely. While the heart and stomach completely forms during the first trimester, the lungs continue to develop past the first trimester. One of the first examples of this is a division between the cells that will make up the placenta and the cells that will make up the baby.
Sometimes the abnormality is inherited from one or both parents; in other cases, the defect occurs because of an error in prenatal development. When the blastocyst arrives at its final destination, the next step is for the outer layer of cells to implant themselves into the walls of the uterus. All of the were formed during the embryonic period of prenatal development, but they continue to develop and grow during the fetal period of prenatal development. This fetal period is described both topically by organ and chronologically by time with major occurrences being listed by gestational age. By the end of the sixth month, the fetus is about 14 inches long and has gained another half pound to a pound. What are the greatest risks from harmful exposures during the first trimester of pregnancy? This is called her background risk.
Mothers who gain less than 20 pounds during pregnancy are at increased risk for having a preterm or low birth weight infant. The endoderm forms the lining of lungs, bladder, digestive tract, tongue, tonsils, and other organs. Each stage of pregnancy brings about a lot of changes in your body. The reduction of blood and oxygen flow may result in miscarriage, stillbirth, low birth weight, and premature births. Plan a balanced diet for a pregnant woman… Words 377 - Pages 2 several psychologists and social scientists to describe development stages in adolescences.
Prenatal exposure to mercury may lead to physical deformation, difficulty in chewing and swallowing, and poor motoric coordination. Cocaine use also results in low birthweight, damage to the central nervous system, and motor dysfunction. By January 21, 2010 Pregnancy is indeed an excellent time for the mother as well as her friends and family. During the prenatal period, the development is so rapid and all takes place… Fetal Development Introduction Fetal development is the growth and maturation of the fetus in utero Fetal Developmet, 2009. The germinal period begins with conception and ends when the blastocyst is fully implanted into uterine tissue.
Fine hair called lanugo first develops on the head; structures such as the lungs, sweat glands, muscles, and bones continue to develop. At this stage the blastocyst consists of 200 to 300 cells and is ready for implantation. Organ systems develop further and start to function. During the fifth week, buds that will form the arms and legs appear. Genetic abnormalities account for approximately 5 percent of miscarriages.
Many sperm cells are released with the possibility of just one managing to adhere to and enter the thick ovum. During this time, the zygote moves from the Fallopian tube toward the uterus and rapidly divides. Prenatal exposure to wartime famine and development of antisocial personality disorder in early adulthood. While in the uterus the structure called the placenta exchanges the nutrients between the pregnant woman and the… The developmental psychology has seven stages this includes infancy, childhood, lover, solder, justice, old age and, finally, dementia and death. At the end of the embryonic period, the embryo is only about an inch long.
Up to this point there is no growth in the overall size of the embryo, as it is confined within a glycoprotein shell, known as the. The face, forehead, eyelids, nose, and chin are distinguishable, as are the upper arms, lower arms, hands, and lower limbs. Identify danger signals that might indicate a complication during pregnancy. A startle reflex develops at this time. At this stage of prenatal pregnant development the neural tube of the baby forms. By the end of the embryonic stage, all essential external and internal structures have been formed. But brain development does not end at birth.