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大脑是整个神经的最高统帅,也是人类优胜于其他动物的主要器官。一个成人的大脑平均重量约1500克,所含神经细胞的数目达140亿之多。哺乳动物中的黑猩猩,尽管身躯庞大,可大脑的重量却只有500多克,仅为人类大脑的1/3。人类的大脑不仅在重量上占显著优势,大脑的表面积也为所有动物之冠。人类大脑分为左、右两个半球,内层主要由神经纤维组成,称为髓质,起着联络、沟通的作用。由于颅骨的限制,高度发达的大脑皮层在颅腔内
The brain is the supreme commander of the entire nerve, and it is also the chief organ of mankind superior to other animals. The average weight of an adult’s brain is about 1500 grams, and the number of nerve cells contained is as much as 14 billion. Chimpanzees in mammals, despite their large bodies, can only weigh more than 500 grams of brain, which is only 1/3 of the human brain. Not only does the human brain have a significant advantage in weight, the brain’s surface area is also the highest of all animals. The human brain is divided into two hemispheres: left and right. The inner layer is mainly composed of nerve fibers called medulla, which plays a role in communication and communication. Due to the limitation of the skull, the highly developed cerebral cortex is in the cranial cavity