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Most nerves serve both functions and are called mixed nerves. White matter includes all of the nerves, and much of the interior of the brain and spinal traceur de fonction online dating. It was in the decade of that we became aware of how basic neuronal networks code stimuli and thus basic concepts are possible David H.

There are, however, a few exceptions to this rule, notably including the part of the dating called the basal ganglia Arthropods, such as insects and crustaceans, have a nervous system made up of a series of ganglia, connected by a ventral nerve cord made up of two parallel connectives running along the length of the belly.

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Somatic nerves mediate voluntary movement. The CNS contains the brain and spinal cord. The enteric nervous system functions to control the gastrointestinal system.

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The PNS consists mainly of nerves, which are enclosed bundles of the long fibers or axons, that connect the CNS to every other part of the body. Both autonomic and enteric nervous systems function involuntarily. Nervous tissue first arose in wormlike organisms about to million years ago.

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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.

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 head segment contains the brain, also known as the supraesophageal ganglion. Nerves that exit from the cranium are called cranial nerves while those exiting from the spinal cord are called spinal nerves.

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There is an anatomical convention that a cluster of neurons in the brain or spinal cord is called a nucleus, whereas a cluster of neurons in the periphery is called a ganglion.