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In the insect nervous system, the brain is anatomically divided into the protocerebrum, deutocerebrum, and tritocerebrum.Immediately behind the brain is the subesophageal ganglion, which is composed of three pairs of fused ganglia.The neurons that give rise to nerves do not lie entirely within the nerves themselves—their cell bodies reside within the brain, spinal cord, or peripheral ganglia Glial cells (named from the Greek for "glue") are non-neuronal cells that provide support and nutrition, maintain homeostasis, form myelin, and participate in signal transmission in the nervous system.In the human brain, it is estimated that the total number of glia roughly equals the number of neurons, although the proportions vary in different brain areas.

Nerves that transmit signals from the brain are called motor or efferent nerves, while those nerves that transmit information from the body to the CNS are called sensory or afferent.

The nervous system derives its name from nerves, which are cylindrical bundles of fibers (the axons of neurons), that emanate from the brain and spinal cord, and branch repeatedly to innervate every part of the body.

Nerves are large enough to have been recognized by the ancient Egyptians, Greeks, and Romans, but their internal structure was not understood until it became possible to examine them using a microscope.

The nervous system is the part of an animal's body that coordinates its actions and transmits signals to and from different parts of its body.

Nervous tissue first arose in wormlike organisms about 550 to 600 million years ago.

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The sympathetic nervous system is activated in cases of emergencies to mobilize energy, while the parasympathetic nervous system is activated when organisms are in a relaxed state.

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    If you arrive early for your date, you can stake out on the petio--sidewalk seating--and watch for your date's arrival.

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    Gitarrensolis und Synthesizerklänge lassen mitunter glauben, dass Gilmour & Co der Tributeband einige Geheimnisse verraten haben.

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