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学龄前期儿童神经系统有了一定的发育,4～6岁小儿脑重1250克左右,接近成人脑重量的85%～90%。随着儿童的增长,大脑结构继续发育,神经纤维,特别是大脑联络区神经纤维的髓鞘化已基本完成,这使得神经传导更加迅速、精确。大脑皮层的兴奋和抑制过程均较前加强并逐渐平衡,但兴奋过程仍占优势。兴奋过程的加强,相应地增加了小儿的清醒和活动时间,减少了睡眠时
Preschool children have some development of the nervous system, 4 to 6-year-old children with brain weight about 1250 grams, close to adult brain weight 85% to 90%. With the growth of children, the structure of the brain continues to develop. The myelination of nerve fibers, especially the nerve fibers in the brain contact area, has been basically completed, which makes nerve conduction more rapid and accurate. Excitement and inhibition of the cerebral cortex were strengthened and gradually balanced, but the excitement process is still dominant. The excitement of the process of strengthening, a corresponding increase in children’s wakefulness and activity time, reducing sleep