My boys spend hours adding and subtracting muscles, a respiratory system, nerve endings, epidermis, etc.

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As a professor of neurology at Harvard Medical School, he studied multiple sclerosis, a genetically conditioned disease in which the immune system mistakes nerve tissue for a foreign invader and systematically destroys it.

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The brain's normal pain-sensory system, in which nerve endings send messages to the brain about a threat, goes awry in migraines.

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From the first day out of the box through everyday use as the "nerve center" of a total home entertainment system, Denon's new receivers are designed for total user convenience and enjoyment.

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That is similar to the way the human visual system works, with particular clusters of nerve cells in the brain adapted to respond to, say, horizontal lines, or to lines that run on diagonals.

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Acting as a messenger between the central nervous system and the major organs, the vagus nerve slows the heart rate (through the release of the neurotransmitter acetylcholine), calms the immune response (by controlling the release of proteins called cytokines), and communicates with the muscles that control respiration and digestion.

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Nerve agents stop the body from breaking down the acetylcholine neurotransmitter, overwhelming the nervous system and causing convulsions that can lead to death within minutes of exposure.

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The nerve helps speed up the heart when it is necessary to be on guard and to calm the system down when we feel safe.

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One of serotonin's jobs is to show growing nerve cells how they should connect from the frontal cortex, where reasoning takes place, to the limbic system, the seat of many emotional responses.

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