The nervous system is the part of an animal's body that coordinates the actions of the animal and transmits signals between different parts of its body. In most types of animals it consists of two main parts, the central nervous system (CNS) and the peripheral nervous system (PNS). The CNS contains the brain and spinal cord. The PNS consists mainly of nerves, which are long fibers that connect the CNS to every other part of the body. The PNS includes motor neurons, mediating voluntary movement, the autonomous nervous system, comprising the sympathetic nervous system and the parasympathetic nervous system and regulating involuntary functions, and the enteric nervous system, a semi-independent part of the nervous system whose function is to control the gastrointestinal system.
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Some articles on nervous system:
... may be genetically determined, and may result from the way the central nervous system is wired "his reflex demonstrates evolutionary relics in the wiring of a part of ... Sometimes the signals in this system get crossed, and I think this may be why some people sneeze when they think about sex." ...
... Ctenophores have no brain or central nervous system, but instead have a nerve net (rather like a cobweb) that forms a ring round the mouth and is densest near structures such as the comb rows ... its response is determined by the animal's "mood", in other words the overall state of the nervous system ...
... In the nervous system of sea urchins the spines, podia, and pedicellariae all act as sensors ... test parallel to the lateral canals of the water vascular system ...
... Cancer of the nervous system is common in domestic canids, and includes primary neoplasia of the peripheral nervous system, primary neoplasia of the ... Some of the most common of the central nervous system tumors are several types of primary (originating from brain tissue) canine brain tumors ...
... Main article Neurology See also Psychiatry The central nervous system is protected by major physical and chemical barriers ...
Famous quotes containing the words nervous system, system and/or nervous:
“A two-week-old infant cries an average of one and a half hours every day. This increases to approximately three hours per day when the child is about six weeks old. By the time children are twelve weeks old, their daily crying has decreased dramatically and averages less than one hour. This same basic pattern of crying is present among children from a wide range of cultures throughout the world. It appears to be wired into the nervous system of our species.”
—Lawrence Kutner (20th century)
“Society cannot share a common communication system so long as it is split into warring factions.”
—Bertolt Brecht (18981956)
“Last night I fled until I came
To streets where leaking casements dripped
Stale lamplight from the corpse of flame;
A nervous window bled.”
—Allen Tate (18991979)