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Topic: Nervous system

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 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)

 Nervous System - LoveToKnow 1911
Three kinds of tissue are found in the nervous system, nerve fibres, nerve cells, and a supporting tissue called neuroglia.
The white consists of medullated fibres belonging to the central nervous system, and these are splanchnic afferent or centripetal, and efferent or centrifugal.
The system of the lateral line or acustico-lateralis component is sometimes regarded merely as a subdivision of the somatic sensory.
www.1911encyclopedia.org /Nervous_System   (3867 words)

 NERVOUS SYSTEM   (Site not responding. Last check: 2007-11-02)
The nervous system is an internal communication system, relaying signals with short electrical impulses.
The central nervous system is composed of the brain and spinal cord.
The parasympathetic nervous system normalizes the body by balancing it to the state it was in before the stimulus occurred.
www.webnat.com /educ/clNervousSys.asp   (911 words)

 the nervous system
Nervous tissue is composed of two main cell types: neurons and glial cells.
The nervous system coordinates rapid responses to external stimuli.
The Peripheral Nervous System (PNS) connects the CNS to other parts of the body, and is composed of nerves (bundles of neurons).
www.emc.maricopa.edu /faculty/farabee/BIOBK/BioBookNERV.html   (3645 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.
In the peripheral nervous system, a chemical neurotransmitter carries the nerve impulses from neuron to neuron across a synapse (space between neurons).
www.elmhurst.edu /~chm/vchembook/661nervoussys.html   (889 words)

 Nervous System
The nervous system's jobs are to protect your body from harm, notify your body when fuel is needed, maintain balance in most situaions, shut itself down in times of rest, and adapt to the abuses and injuries you have recieved in your own lifetime.
The answer is that the nervous system is the communication network of your body, running by the processes of chemical and eletrical signals.
The somatic nervous system is responsible for the voluntary control of skeletal muscle and for the collection of sensory information from the body.
www.geocities.com /CapeCanaveral/Launchpad/5172/nervous.html   (1371 words)

 The 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 third division of the autonomic nervous system that you do not hear much about.
The enteric nervous system is a meshwork of nerve fibers that innervate the viscera (gastrointestinal tract, pancreas, gall bladder).
www.healingtides.net /nervoussystem.htm   (823 words)

 Nervous System   (Site not responding. Last check: 2007-11-02)
Study of the nervous system is rewarding to morphologists because it is complex, yet conservative in terms of change.
The autonomic system is not isolated, structurally or functionally, from either the central or peripheral nervous system.
The SYMPATHETIC division of the system is said to have a thoracolumbar outflow because this term indicates the levels at which its fibers emerge from the central nervous system in spinal nerves.
www.uta.edu /biology/restricted/3452nerv.htm   (2739 words)

 Nervous system, human definition - Medical Dictionary definitions of popular medical terms   (Site not responding. Last check: 2007-11-02)
Nervous system, human: The sum total of the tissues that record and distribute information within a person, and does so by electrical and chemical means.
The peripheral part of the nervous system is said to be peripheral because it is outside the CNS.
The function of the peripheral nervous system is to transmit information back and forth between the CNS and the rest of the body.
www.medterms.com /script/main/art.asp?articlekey=4542   (234 words)

 Nervous System
The nervous system of the human being is responsible for sending, receiving, and processing nerve impulses throughout the body.
The central nervous system has the responsibility for issuing nerve impulses and analyzing sensory data, and includes the brain and spinal cord.
The autonomic nervous system is composed of the sympathetic and parasympathetic systems and is responsible for regulating and coordinating the functions of vital structures in the body.
library.thinkquest.org /10348/find/content/nervous.html   (336 words)

 Overview of Nervous System Disorders
The nervous system is a complex, sophisticated system that regulates and coordinates body activities.
The nervous system is vulnerable to various disorders.
Physicians who treat nervous system disorders may have to spend a lot of time working with the patient before making a probable diagnosis of the specific condition.
www.healthsystem.virginia.edu /uvahealth/adult_neuro/overview.cfm   (388 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)

 Nervous System / Functions of the Nervous System
The nervous system is the major controlling, regulatory, and communicating system in the body.
Together with the endocrine system, the nervous system is responsible for regulating and maintaining homeostasis.
Like other systems in the body, the nervous system is composed of organs, principally the brain, spinal cord, nerves, and
training.seer.cancer.gov /module_anatomy/unit5_1_nerve_functions.html   (265 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)

 Nervous system
Nervous systems aid in the regulation and maintenance of homeostasis of an organism
The two major portion of a vertebrate nervous system are the central nervous system (CNS), and the peripheral nervous system.
The parts of the autonomic nervous system are the parasympathetic system and the sympathetic system.
mysite.verizon.net /vzepz6a9/biorefweb/nervous.html   (1348 words)

 Nervous System Information
As the most complex system, the nervous system serves as the body control center and communications electrical-chemical wiring network.
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.besthealth.com /besthealth/bodyguide/reftext/html/nerv_sys_fin.html   (2327 words)

 THE HUMAN NERVOUS SYSTEM   (Site not responding. Last check: 2007-11-02)
The Peripheral Nervous System (PNS) is responsible for the body functions which are Not under conscious control - like the heartbeat or the digestive system.
Distinguish between the somatic nervous system and the autonomic nervous system.
The Italian scientist Luigi Galvani found that nervous tissue (groups of cells that conduct impulses) displays Electrical Activity in the form of a Nerve Impulse, which is a flow of electrical charges along The Cell Membranes of a Neuron.
www.sirinet.net /~jgjohnso/nervous.html   (3217 words)

 PATTS - Nervous System
The system is composed of specialized cells, termed nerve cells or neurons, that communicate with each other and with other cells in the body.
The remaining areas of the nervous system are tracts of axons, the white matter, so-called because of white myelin sheath.
The two systems function together, with nerves from the periphery entering and becoming part of the central nervous system, and vice versa.
webschoolsolutions.com /patts/systems/nervous.htm   (1867 words)

Nervous tissue is the fourth basic tissue type of the body and is organized into two basic systems: (1) the Central Nervous System (CNS) and (2) the Peripheral Nervous System (PNS).
Regular connective tissue types surround the components of the central nervous system, but they are not found within the tissue.
Ganglions of the sympathetic system (Ganglion 4) are easily distinguished from others by the presence of lipofuscin pigment within the cytoplasm of the cell bodies (Ganglion 5).
lifesci.rutgers.edu /~babiarz/nervous.htm   (903 words)

 Brain and Nervous System
If you think of the brain as a central computer that controls all the functions of your body, then the nervous system is like a network that relays messages back and forth from it to different parts of the body.
A part of the peripheral nervous system called the autonomic nervous system is responsible for controlling many of the body processes we almost never need to think about, like breathing, digestion, sweating, and shivering.
The autonomic nervous system has two parts: the sympathetic and the parasympathetic nervous systems.
kidshealth.org /parent/general/body_basics/brain_nervous_system.html   (2635 words)

 14. Nervous System
The nervous system is divided into a peripheral portion and a central portion.
The spinal ganglia (= dorsal root ganglia) are important components of the peripheral nervous system, but disregard the spinal cord until the next laboratory session on the central nervous system.
This is where the preganglionic cell bodies of the autonomic system are located (where do their axons go?) You can see the lateral horn as a distinct bulge in at least one of your sections and as a zone with several large neurons in others (illustration).
neuromedia.neurobio.ucla.edu /campbell/nervous/wp.htm   (4373 words)

 nervous system   (Site not responding. Last check: 2007-11-02)
On section, they are seen to consist of a reddish grey substance, traversed by numerous white nerve-fibres: they vary considerably in form and size; the largest are those found in the cavity of the abdomen; the smallest, the microscopic ganglia, which exist in considerable numbers upon the nerves distributed to the different viscera.
Sometimes a plexus is formed by the primary branches of the trunks of the nerves, as the cervical, brachial, lumbar, and sacral plexuses, and occasionally by the terminal fasciculi, as in the plexuses formed at the periphery of the body.
Occasionally the elementary nerve-fibres, as in the nerves of special sense, may be brought into connection at their periphery with cells similar to those met with in the grey matter of the brain and ganglia.
nervous-systems.com /nerv_index.html   (2066 words)

 Welcome To The Nervous System
The nervous system is a very complex system in the body.
The nervous system is divided into two main systems, the central nervous system (CNS) and the peripheral nervous system.
The peripheral nervous system is made up of all of the nerves and the wiring.
library.thinkquest.org /5777/ner1.htm   (99 words)

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