Lanugo begins to cover all skin surfaces, and fat begins to develop under the skin. The fetus reaches approximately 38 cm. The Fetal Stage The last stage of prenatal development is the fetal stage, which lasts from two months after conception until birth. Beginning development of the brain, heart, blood cells, circulatory system, spinal cord, and digestive system. Stress[ edit ] Stress during pregnancy can impact the development of the embryo. Maternal derived abnormalities The age, health status, nutritional status, and environment of the mother are all closely tied to the health of a growing embryo or fetus.
The placenta has two important functions: Certain vitamin and mineral deficiencies can interfere with normal prenatal development. Examples of teratogens include alcohol, thalidomide, cocaine, certain seizure medications, diethylstilbestrol DES , and the anti-acne drug Accutane. If the exposure occurs during the first trimester, eye and brain damage may result. Some common prenatal tests that relate to prenatal development are as follows: During this time, a single-celled zygote develops in a series of stages into a full-term baby. Iron and iodine are especially important during prenatal development. Viruses such as rubella, chicken pox, mumps, herpes, and human immunodeficiency HIV are associated with increased risk of miscarriage, low birth weight, and prematurity, physical malformations, and intellectual disabilities. It only dealt with the right hemisphere being more developed than the left side. UNSW Embryology , The cause may be a small mutation in or damage to the genetic material of cells, or a major chromosomal abnormality each normal cell has two copies each of 23 strands [called chromosomes] of genetic material, and abnormalities can arise if there are three copies of a strand or only one. In people who have brain damage following accidents, left hemisphere damage is more likely to cause language problems in men, whereas in women, language test scores tend not to be affected by whether the damage is to the left or right. For example, the ectoderm eventually forms skin, nails, hair, brain, nervous tissue and cells, nose, sinuses, mouth, anus, tooth enamel, and other tissues. The fetus reaches approximately 38—43 cm. Whether or not a premature infant will survive is intimately tied to his or her gestational age: The developing ball of cells is now called an embryo. The fetus's bones are developed but not yet hardened. In a sense, males exposed to normal levels of prenatal testosterone are right handed and systematized. It also results in a shortened gestational period and can lead to prenatal complications. The fetus reaches approximately Congenital abnormalities In some cases abnormalities may arise during prenatal development that cause physical malformations or developmental delays or affect various parts of the body after the child is born. About sixty hours after fertilization, approximately sixteen cells have formed to what is called a morula, still enclosed by the zona pellucida; three days after fertilization, the morula enters the uterus. Beginning development of bones, facial structures, and limbs presence of arm and leg buds ; continuing development of the heart which begins to beat , brain, and nervous tissue. Some of the major events that occur during the embryonic stage are as follows: Beginning development of hands, feet, and digits; continuing development of brain, heart, and circulation system. Mothers who are deficient in iron are at risk for having a preterm or low birth weight infant.
Video about development of sex organs in fetus:
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