大脑是一种在结构上极其复杂的组织，最基本的构造单位是脑细胞，即神经元。在胚胎发育过程中，神经元与胎儿机体任何器官的增长一样，都意味着是细胞数量的增殖和细胞体积大小的增长，或者两者同时进行。 儿脑的发育有赖于神经胶质细胞，营养不良的婴儿脑细胞数减少，致
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