"Major Characteristics of Development"
Physical - Physical development obviously starts long before the common "infantile" stage that we all think of today. Brain development begins in the weeks following conception. A noticeable brain is apparent after only three to four weeks, when the neural plate folds up to form the neural tube. The bottom of the tube becomes the spinal cord. "Lumps" then emerge at the top of the tube and form the forebrain, midbrain, and hindbrain. The so-called primitive or lower portions of the brain develop earliest, and regulate such biological functions as digestion, respiration, and elimination; they also control sleep-wake states and permit simple motor reactions. All of the above traits of the brain are what makes life possible. By three months after conception, the midbrain and hindbrain are well on their way to being developed, but the forebrain still has a long way to go. Gradually these two hemispheres become larger and more convoluted, making for a characteristically human brain. Many processes are involved in early brain development, but I won't go into much detail as they are not true parts of infancy physical development.…
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