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[7] The second trimester is also essential for perinatal brain development. By week 20 of pregnancy, the area of the brain that is responsible for the awareness of the fetus's five sense begins to develop. In the fifth month of pregnancy, the fetal senses can be stimulated which results in the growth of synapses.
The rule estimates the expected date of delivery (EDD) by adding a year, subtracting three months, and adding seven days to the origin of gestational age. [13] [14] The result is approximately 280 days (40 weeks) from the start of the last menstrual period. Another method is by adding 9 months and 7 days to the first day of the last menstrual ...
The embryo measures 13 mm (1 ⁄ 2 in) in length. Lungs begin to form. The brain continues to develop. Arms and legs have lengthened with foot and hand areas distinguishable. The hands and feet have digits, but may still be webbed. The gonadal ridge begins to be perceptible. The lymphatic system begins to develop. Main development of sex organs ...
In human pregnancy, prenatal development is also called antenatal development. The development of the human embryo follows fertilization , and continues as fetal development . By the end of the tenth week of gestational age , the embryo has acquired its basic form and is referred to as a fetus .
Human embryology is the study of this development during the first eight weeks after fertilization. The normal period of gestation (pregnancy) is about nine months or 36 weeks. The germinal stage refers to the time from fertilization through the development of the early embryo until implantation is completed in the uterus.
Researchers followed a 38-year-old woman three weeks before conception, and two years postpartum, tracking the changes to her brain via a series of 26 MRI scans.
In early development (before birth and during the first few months), the brain undergoes more changes in size, shape and structure than at any other time in life. Improved understanding of cerebral development during this critical period is important for mapping normal growth, and for investigating mechanisms of injury associated with risk ...
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