Brain development begins early in the fetus in a well-ordered sequences with variable timing in
different portions of the brain. The development continue through infancy and the second year of
life, and overall brain development continues into adolescence. During this period of development, the brain is highly vulnerable to neurotoxins (poisons of the nerves).
Many substances, including toxicants (man-made poisons), easily penetrate the placenta during fetal development, and because the fetal blood–brain barrier is not fully formed, toxicants can enter and cause neurological and developmental defects through direct cellular toxicity or interference with a variety of cell . . .
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