B.A. PSYCHOLOGY, SOCIOLOGY AND ENGLISH Lecture Notes - Neural Tube Defect, Neural Tube, Anencephaly
13 May 2022
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Document Summary
One of the most remarkable aspects of the prenatal period is the development of the brain. By the time babies are born, they have approximately 100 billion neurons, or nerve cells. Four important phases of brain development: : neural tube: As the human embryo develops inside its mother"s womb, the nervous system begins forming and is located on the embryo"s back. This pear-shaped neural tube, which forms at about 18 to 24 days after conception, develops out of the ectoderm. The tube closes at the top and bottom ends at about 24 days after conception. Two birth defects related to a failure of the neural tube to close are anencephaly and spina bi da. The highest regions of the brain fail to develop when fetuses have anencephaly or when the head end of the neural tube fails to close, and they die in the womb, during childbirth, or shortly after birth.
