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An embryo forms the neural tube. The neural tube is the earliest nervous system tissue and eventually develops into the brain and the spinal cord.
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The neural tube begins to differentiate into brain cells and nerve cells. The brain cells transform into recognizable brain structures..The cerebral cortex is formed.
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The basic brain development allows the embryo to display reflexes and react to its environment.
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The fetus can experience sensory sensations such as sound, taste, and smells.
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The fetus is learning to control it's reactions to the sensory sensations and to control its movement.
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During the 6th month the ability to react to these sensations become stronger.
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The baby's hearing is fully developed and he or she can change positions frequently and responds to stimuli, including sound, pain, and light.
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Baby's brain is developing rapidly at this time, and he or she can see and hear.
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brain weight doubles in the last 9 weeks of pregnancy.1 Much of the brain’s weight gain is due to the thickening of the myelin sheath around the nerves.