BrainThe brain is a mass of soft nerve tissue, which is inside the skull. The brain is mainly nerve cell bodies and cell processes. The brain controls what happens in the body.
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Spinal CordThe spinal cord is about 45 centimeters long. It starts at the brain and ends at the lumbar vertebrae. The spine is like a message pathway connecting the brain with the rest of the nervous system. Nerves that are conveying impulses from the brain go down from the spinal cord to different locations in the body.
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How it Connects
The nervous system works with the muscular system by controlling the muscles. The nervous system controls the respiratory system and the circulatory system. The nervous system works with the integumentary system by giving us the sense of touch.