Different parts of our brain control different parts of our body.
One part is in charge of understanding what the eyes see; another part directs; a different part controls; still another exercises. The left side of the brain controls on the right side of the body and receives sensation from the right side of the body, and vice versa. Evidence suggests that the brains' left hemisphere tends to deal with reasoning and communication and the right hemisphere with emotions and perception of shapes. All the parts of the brain do their work and talk to each other over a network of nerve cells called neurons.
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The brain works on electricity. The normal brain is constantly generating electrical rhythms in an orderly way. Millions of tiny electrical charges pass between a network of nerve cells in the brain and to all parts of the body via chemical messengers called neurotransmitters, which cause the nerve cells to fire or stop firing. In simple terms, the nerve cells, called neurons, are the brain's telephone system, sending electric charges from one point to another. Normal human experiences occur when specialized parts of the brain responsible for taste, smell, movement, memory etc. are sufficiently excited. This is how we think, feel and move.
 Move your finger now. When you do so, muscle fibres on each side of your finger joint are involved. Different groups of brain cells control the different muscle fibres, and their coordinated firing is what allows you to manipulate your finger smoothly.
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