Learn About The Nervous System

The nervous system is your body's control and communication system, made up of nerves and the brain. Nerves are your body's hot-lines, carrying instant messages from the brain to every organ and muscle - and sending back an endless stream of data to the brain about what is going on both inside and outside your body.

The central nervous system (CNS) is the brain and spinal cord (see central nervous system).

The peripheral nervous system (PNS) is made up of the nerves that branch out from the CNS to the rest o fthe body.

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There are simple diagrams of the eye, ear, nose, and tongue, and explanations about how nerves "like wires" carry messages to the brain.

The main branches of the PNS are the 12 cranial nerves in the head, and the 31 pairs of spinal nerves that branch off the spinal cord.

The nerves of the PNS are made up of long bundles of nerve fibers, which in turn are made from the long axons (tails) of nerve cells, bound | together Iike the wires in a telephone cable.

In many places, sensory nerves (which carry sense signals from the body to the brain) run
alongside motor nerves (which carry the brain's ^ commands telling muscles to move).

Some PNS nerves are as wide as your VI thumb. The longest is the sciatic, which runs from the base ofthe spine to the knee.

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The autonomic nervous system (ANS) is the body's third nervous system. It controls all internal body processes such as breathing automatically, without you even being aware of it.

The ANS is split into two complementary (balancing) parts - the sympathetic and the parasympathetic. The sympathetic system speeds up body processes when they need to be more active such as when the body is exercising or under stress. The parasym pathetic slows them down.

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Millions of nerve signals enter your brain every single second of your life.

Sympathetic nervous system - Wikipedia, the free encyclopedia: The sympathetic nervous system extends from the thoracic to lumbar vertebrae and has connections with the thoracic, abdominal, and pelvic plexuses. ... Url : http://en.wikipedia.org/wiki/Sympathetic_nervous_system Cache (Ranked #27)
Virtual Anatomy Textbook: Nervous System: PUT YOUR NON-FRAMES NON-JAVASCRIPT HTML HERE! Url : http://www.acm.uiuc.edu/sigbio/project/nervous/ Cache (Ranked #28)
The Central Nervous System: The cells of the central nervous system are bathed in a fluid that differs from that serving as the ECF of the cells in the rest of the body. ... Url : http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/C/CNS.html Cache (Ranked #29)
WebAnatomy Nervous System: Nervous System. Nerves of the head and neck. Anatomy TV. Problems? Contact Murray Jensen. msjensen@umn.edu. Neurons. Neuron 1 - Short - Medium ... Url : http://msjensen.cehd.umn.edu/webanatomy/nervous/default.html Cache (Ranked #28)
Nervous System: Nervous System This information will help you find out why the nervous system is the control and communication system of the body. ... Url : http://hes.ucfsd.org/gclaypo/nervoussys.html Cache (Ranked #27)