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脑位于颅腔之内,由大脑、间脑、小脑和脑干组成。脑主宰着生命,统率神经系统,协调人体适应外部环境,维持和稳定人体的内部环境。大脑皮层表面积有0.25平方公里之大,神经细胞达100亿个以上。脑供血营养,从脑前动脉、中动脉和后动脉正常流量而获得。人脑重量约占人体总重量的2%,其能量消耗却占人体能量总耗的20%,可见,
The brain is located within the cranial cavity, the brain, diencephalon, cerebellum and brain stem composition. The brain dominates life, controls the nervous system, coordinates the human body to adapt to the external environment, and maintains and stabilizes the internal environment of the human body. Cerebral cortex surface area of 0.25 square kilometers of large, more than 10 billion nerve cells. Cerebral blood supply is obtained from the normal flow of the anterior, middle, and posterior arteries. Human brain weight accounts for about 2% of the total body weight, its energy consumption accounts for 20% of the total human energy consumption, we can see,