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4 Jan 2012
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The neural plate then begins to fuse to form the neural tube, the tube that"s formed out of the ectoderm @ embryonic day 24; it will eventually become the spinal cord and brain. Btwn the 3rd and 5th months of gestation, the dominant events are neural migration and proliferation, the process of cell division that results in new neurons. By embryonic day 40, there are 3 prominent bumps on the anterior portion of the neural tube that eventually form the forebrain, midbrain, and hindbrain of the central nervous system (cns) Although the brain is extra vulnerable during the last 4-5 months of gestation, failures. @ any point in cns dvlpt can have significant impact on the final form of the brain. > adverse events can originate f/ problems within the neurons themselves like genetic or chromosomal abnormalities or by external factors such as intrauterine trauma or exposure to toxins (lead, alcohol)

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