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Topic: Voluntary nervous system

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Nervous system

Autonomic nervous system

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	Nervous System...MedicalGeo.com
		The somatic nervous system is the voluntary part of the nervous system that coordinates a body's movements, such as maintaining a particular posture and walking.
		The sympathetic nervous system responds to impending danger or stress, and is responsible for the increase of one's heartbeat and blood pressure, among other physiological changes, along with the sense of excitement he feels.
		The parasympathetic nervous system, on the other hand, is evident when a person is resting and feels relaxed, and is responsible for such things as the constriction of the pupil, the slowing of the heart, the dilation of the blood vessels, and the stimulation of the digestive and geniturinary systems.
	www.medicalgeo.com /nervoussystem.html (524 words)

	nervous system. The Columbia Encyclopedia, Sixth Edition. 2001-05
		Invertebrate animals show varying degrees of complexity in their nervous systems, but it is in the vertebrate animals (phylum Chordata, subphylum Vertebrata) that the system reaches its greatest complexity.
		The central nervous system consists of the brain and spinal cord.
		All of the fibers of the autonomic nervous system are motor channels, and their impulses arise from the nerve tissue itself, so that the organs they innervate perform more or less involuntarily and do not require stimulation to function.
	www.bartleby.com /65/ne/nervouss.html (1463 words)

	Early American Manual Therapy
		The spinal cord, the central nervous system, occupies the upper two-thirds of the vertebral canal.
		The nervous system is twofold in its stimuli, that which is somatic, from the external world, concerned in animal life, the outward actions of animals, and that which is interested in the processes of nutrition and reproduction, the visceral, the excretory, the alimentary tract, the blood and lymph of the vascular system.
		The cerebrospinal system and the sympathetic nerve system are intimately connected, the latter is derived from the dependent upon the former; it is especially concerned in the dissemination of innervation, nutrition and the functionating of the vegetative organs.
	www.meridianinstitute.com /eamt/files/palmer/palm13.html (2133 words)

	Somatic nervous system - Wikipedia, the free encyclopedia
		The somatic nervous system is that part of the peripheral nervous system associated with the voluntary control of body movements through the action of skeletal muscles, and also reception of external stimuli.
		The somatic nervous system consists of afferent fibers that receive information from external sources, and efferent fibers that are responsible for muscle contraction.
		The upper motor neuron carries this stimulus down the corticospinal tract and synapses in the ventral horn of the spinal cord with the alpha motor neuron, a lower motor neuron.
	en.wikipedia.org /wiki/Somatic_nervous_system (273 words)

	Neuroscience For Kids - Explore the nervous system
		The peripheral nervous system is divided into two major parts: the somatic nervous system and the autonomic nervous system.
		The autonomic nervous system is divided into three parts: the sympathetic nervous system, the parasympathetic nervous system and the enteric nervous system.
		The enteric nervous system is a meshwork of nerve fibers that innervate the viscera (gastrointestinal tract, pancreas, gall bladder).
	faculty.washington.edu /chudler/nsdivide.html (1209 words)

	Learn more about Nervous system in the online encyclopedia. (Site not responding. Last check: 2007-10-16)
		The nervous system of an animal coordinates muscle movement, monitors the organss, constructs and processes impressions from the senses, and initiates actions.
		Neurons are the primary cells of the nervous system, in that they more or less independently conduct the system's moment-to-moment activities, whereas glia play what at least appears to be a more supporting role, such as nourishment and structural support.
		The sympathetic nervous system is responsible for the excitment that a person feel due to the increase of heartbeat.
	www.onlineencyclopedia.org /n/ne/nervous_system_1.html (547 words)

	Autonomic nervous system (Site not responding. Last check: 2007-10-16)
		Anatomy and Physiology of the A.N.S. In contrast to the voluntary nervous system, the "involuntary" or autonomic nervous system is responsible for homeostasis, maintaining a relatively constant internal environment by controlling such involuntary functions as digestion, respiration, and metabolism, and by modulating blood pressure.
		This is why the enteric nervous system is sometimes referred to as a "second brain." (''Hospital Practice'', The Enteric Nervous System: A Second Brain, Michael D. Gershon, MD, Columbia University) (http://www.hosppract.com/issues/1999/07/gershon.htm) The enteric nervous system regulates secretions of the intestinal glands, regeneration of the intestinal epithelium, and intestinal motility.
		The peripheral portion of the sympathetic nervous system is characterized by the presence of numerous ganglia and complicated plexuses.
	autonomic-nervous-system.kiwiki.homeip.net (3133 words)

	Nervous
		The nervous system is by far the most rapid acting and complex system of the body.
		The cells of the nervous system communicate by means of electrical signals, which are rapid, specific, and usually cause almost immediate responses.
		The somatic nervous system is composed of motor nerve fibers that connect the CNS to the skeletal muscles and is often referred to as the voluntary nervous system.
	library.advanced.org /11965/html/cyber-anatomy_nervous.html (392 words)

	[No title]
		Autonomic Nervous System In the previous section you saw that the somatic nervous system receives sensory input from the skin, muscle, viscera, and sense organs, all of which are perceived at the conscious level.
		Although the autonomic nervous system functions as a unit in that it controls the homeostatic balance of the body, two distinct divisions of the autonomic nervous exist exist: the sympathetic and parasympathetic divisions.
		Parasympathetic Nervous System Preganglionic fibers of the parasympathetic division exit the CNS from some of the cranial nerves and from the lowest level of the spinal cord, the sacral elements.
	mcb.berkeley.edu /courses/mcb32/mcb32downloads/kruger7.doc (4629 words)

	Nervous System (Site not responding. Last check: 2007-10-16)
		The central nervous system is the larger of the two and consists of the brain (located within the skull) and the spinal cord (located within the vertebral column.) It is in charge of controlling how a person receives and processes data, how a person moves, as well as how well the senses function.
		The peripheral nervous system consists of the nerve cells that exist outside of the central nervous system (such as those used for extremities and organs) and are used to transmit data from the body to the brain and vice versa.
		The autonomic nervous system is further broken down into three categories: the sympathetic, the parasympathetic and the enteric.
	www.iscid.org /encyclopedia/Nervous_System (228 words)

	Nervous System / Organization of the Nervous System
		The nervous system as a whole is divided into two subdivisions: the central nervous system (CNS) and the peripheral nervous system (PNS).
		The brain and spinal cord are the organs of the central nervous system.
		The organs of the peripheral nervous system are the nerves and ganglia.
	training.seer.cancer.gov /module_anatomy/unit5_3_nerve_org.html (380 words)

	[No title]
		The nervous system and the endocrine system are the body’s major control and integrating centers.
		Neurology is the study of the normal functioning and disorders of the nervous system.
		The major components of the nervous system include the brain, cranial nerves, spinal cord, spinal nerves, and enteric plexuses; a nerve is a bundle of axons (plus associated connective tissue and blood vessels) located outside the brain and spinal cord.
	www.angelo.edu /faculty/cadkins/AnatLOch17.doc (1324 words)

	Untitled Document (Site not responding. Last check: 2007-10-16)
		Horner's syndrome is an intriguing disorder of the nervous system that is complex to explain.
		There is the part of your nervous system that you are aware of and have control over.
		This is the 'fight or flight' reaction and is characteristic of the sympathetic nervous system.
	www.gvsvet.com /horners.htm (835 words)

	Nervous System
		The nervous system is composed of all nerve tissues in the body.
		The peripheral nervous system includes all nerves not in the brain or spinal cord and connects all parts of the body to the central nervous system.
		The somatic nervous system controls functions that are under conscious voluntary control such as skeletal muscles and sensory neurons of the skin.
	www.elmhurst.edu /~chm/vchembook/661nervoussys.html (889 words)

	Frameless Our Nervous System
		The nervous system is also a means of quick co-ordination between different parts of the body.
		The nervous tissue of the central nervous system consists of the grey matter and the white matter.
		The spinal cord is a cylindrical mass of nervous tissue extending posteriorly from the medulla oblongata to the end of the vertebral column.
	library.thinkquest.org /19347/frameless_nervoussys.htm (1237 words)

	Nervous System Information - Washington, DC
		PNS: somatic (voluntary) nervous system, autonomic (involuntary) nervous system
		The nervous system integrates countless bits of information and generates appropriate reactions by sending electrochemical impulses through nerves to effector organs such as muscles and glands.
		The brain and spinal cord are the central nervous system (CNS); the connecting nerve processes to effectors and receptors serve as the peripheral nervous system (PNS).
	www.georgetownuniversityhospital.org /body.cfm?id=555563&action=articleDetail&AEProductID=Adam_BGuide&AEArticleID=31 (2354 words)

	Nervous System (Site not responding. Last check: 2007-10-16)
		For heuristic and other purposes, the nervous systems of vertebrate animals are often divided into a central (CNS) and a peripheral nervous systems (PNS).
		The PNS consists of sensory pathways and motor pathways, the latter being divided into the somatic (voluntary) nervous system and the autonomic nervous system.
		The somatic nervous system is the voluntary part of the nervous where it coordinates the movement such as posture and walking.
	www.painbustersclinic.com.au /body/nervous-system.htm (435 words)

	THE NERVOUS SYSTEM
		This unit of the nervous system is similar to an output device (printer, monitor).
		Thus, central nervous system in bilateral animals consists of the brain and nerve cords.
		All information from the periphery nervous system (PNS), motor functions and sensory activities are received, processed, analyzed and relayed or commands are issued for their respective responses.
	www.gpc.edu /~decms/ibim/nervoussystem2.htm (5281 words)

	The Autonomic Nervous System (page 1) (Site not responding. Last check: 2007-10-16)
		The nervous system is divided into the somatic nervous system which controls organs under voluntary control (mainly muscles) and the Autonomic Nervous System (ANS) which regulates individual organ function and homeostasis, and for the most part is not subject to voluntary control.
		The ANS is predominantly an efferent system transmitting impulses from the Central Nervous System (CNS) to peripheral organ systems.
		The preganglionic outflow of the parasympathetic nervous system arises from the cell bodies of the motor nuclei of the cranial nerves III, VII, IX and X in the brain stem and from the second, third and fourth sacral segments of the spinal cord.
	www.nda.ox.ac.uk /wfsa/html/u05/u05_010.htm (879 words)

	Glossary - Nervous System Diseases Health Guide
		central nervous system - the brain and the spinal cord.
		extrapyramidal system - system consisting of nerve cells, nerve tracts and pathways that connects the cerebral cortex, basal ganglia, thalamus, cerebellum, reticular formation, and spinal neurons that is concerned with the regulation of reflex movements such as balance and walking.
		gray matter - the darker-colored tissues of the central nervous system; in the brain, the gray matter includes the cerebral cortex, the thalamus, the basal ganglia, and the outer layers of the cerebellum.
	www.umm.edu /nervous/glossary.htm (1771 words)

	The ANS
		The autonomic nervous system conveys sensory impulses from the blood vessels, the heart and all of the organs in the chest, abdomen and pelvis through nerves to other parts of the brain (mainly the medulla, pons and hypothalamus).
		Through these nervous pathways, the autonomic nerves convey stimuli resulting in largely unconscious, reflex, bodily adjustments such as in the size of the pupil, the digestive functions of the stomach and intestines, the rate and depth of respiration and dilatation or constriction of the blood vessels.
		Like other nerves, those of the autonomic nervous system convey their messages to the appropriate end organs (blood vessels, viscera, etc.) by releasing transmitter substances to which the receptors of the target cells are responsive.
	www.ndrf.org /ans.htm (1404 words)

	Nervous System Problems -- Topic Overview
		The nervous system is divided into the brain and spinal cord (central nervous system, or CNS) and the nerve cells that control voluntary and involuntary movements (peripheral nervous system, or PNS).
		The symptoms of a nervous system problem depend on which area of the nervous system is involved and what is causing the problem.
		Nervous system problems may occur slowly and cause a gradual loss of function (degenerative), or they may occur suddenly and cause life-threatening problems (acute).
	www.webmd.com /hw/brain_nervous_system/hw97809.asp (245 words)

	THE NERVOUS SYSTEM (Site not responding. Last check: 2007-10-16)
		The nervous system is composed of neurons and neuroglia.
		Organs of the nervous system can be divided into the central nervous system (CNS), made up of the brain and spinal cord, and the peripheral nervous system (PNS), made up of peripheral nerves that connect the CNS to the rest of the body.
		The autonomic nervous system is largely controlled by reflex centers in the brain and spinal cord.
	www.sirinet.net /~jgjohnso/nervoussystem.html (1979 words)

	Central Nervous System, Nervous System . . .
		The gray matter is nervous tissues of a grayish color that forms an "H" shaped structure and is surrounded by white matter.
		The the autonomic nervous system (ANS) is under control of central nervous system and is also part of the peripheral nervous system, although these nerves stay within the body and effect organs and soft tissues and do not leave to effect appendages (arms and legs).
		The autonomic nervous system (ANS) is "automatic" and in control of involuntary bodily functions and it is divided into two parts: The sympathetic and parasympathetic nervous system.
	www.drstandley.com /bodysystems_centralnervous.shtml (920 words)

	Polite Dissent » Uncanny X-Men #446: A Medical Review: comics, medicine, and medical comics
		However, the parasympathetic nervous system is part of the involuntary nervous system, so controlling it would do nothing in regards to voluntary functions.
		Skeletal muscles are controlled by the voluntary nervous system, whereas smooth muscles (heart, gut) are controlled by the involuntary system.
		Also remember that the involuntary nervous system is composed of two opposing systems: the sympathetic and parasympathetic nervous systems.
	politedissent.com /archives/265 (735 words)

	Hawkeen Training
		The central nervous system is generally associated with the conscious mind while the autonomic is associated with the nonconscious.
		Thus, when we speak of physiology we are speaking of the functioning of the autonomic nervous system with the knowledge that physiology in general is not limited to it.
		It becomes obvious that stress is the result of stimulation of the sympathetic branch of the autonomic nervous system and relaxation is the result of stimulation of parasympathetic branch.
	www.navaching.com /hawkeen/pmap.html (2191 words)

	Nervous System - A range of self-help measures including herbal remedies for for diseases ranging from anxiety to ...
		All mental and physical activities are controlled or mediated by the brain and the nervous system.
		Voluntary actions originate in the brain and the nerves carry the information to other parts of our body.
		In multiple sclerosis, the immune system actively damages myelin, the protective covering of nerves in the brain and spinal cord in the central nervous system.
	www.herb-health-guide.com /nervous-system.html (2592 words)

	Chapter 8
		The voluntary nervous system is that part of the brain and nerves that are under the control of the conscious mind.
		The autonomic nervous system is that part of the brain and nervous system that carries on the functions of the body that we have very little or no conscious control over.
		The autonomic nervous system regulates the basic life-sustaining functions of the body such as the turning on and off of glands and organs, maintaining the acid/alkaline balance of the blood, saliva, and urine, digestion of food, balancing glandular functions, turning the cells on and off, and stimulating and retarding the body and its parts.
	www.whale.to /cancer/k/Ch8.html (4004 words)

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