
Fetal brains share 61 percent of the same functional organization as adult brains shortly before birth, according to developmental neuroscientist Moriah Thomason. The brain's 100 billion neurons and 100 trillion connections form efficiently from a neural tube. Birth transforms the brain as myelin sheaths develop in response to new sensory information.
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Summary by ByteBrief
Our Brain Is 300,000 Years Old, Our Inbox Is Not