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The human brain is the central organ of the human nervous system. The human brain, with the spinal cord, makes up the central nervous system. The brain consists of the the cerebrum, its largest part, the brainstem and the cerebellum. The brain is the organ that controls most of the activities of the body.
The brain has three major parts: 1  The cerebrum is the largest part of the brain. It is at the top of the head. 2  The cerebellum is in the lower back of the brain (near the middle of the back of the head). It controls movement, balance, and posture. 3  The brain stem connects the brain to the spinal cord.