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It is not a substitute for professional medical advice, diagnosis or treatment and should not be relied on to make decisions about your health. Never ignore professional medical advice in seeking treatment because of something you have read on the WebMD Site.

If you think you may have a medical emergency, immediately call your doctor or dial 911. Sources IMAGES PROVIDED BY:ThinkstockGetty ImagesGetty ImagesGetty ImagesGetty ImagesThinkstockScience SourceGetty ImagesGetty ImagesGetty ImagesThinkstockThinkstockThinkstockThinkstockThinkstockThinkstockThinkstockGetty ImagesGetty ImagesGetty ImagesGetty ImagesGetty Images SOURCES: O'Rahilly, R.

Johns Hopkins Medicine: "Neurology and Neurosurgery: Peripheral Nerve System," "Healthy Aging: The Brain-Gut Connection," "Health Library: Overview color mood Nervous System Disorders. Medical Marijuana: How It's Used Treating and Preventing Migraines Health Solutions Penis Curved When Erect. Skaggs, ScholarpediaThe nervous system is the part of an animal's body that coordinates its behavior and transmits signals between different body areas.

In vertebrates it consists of two main parts, called Dr-Dw central nervous system (CNS) and the peripheral nervous system (PNS).

The CNS contains the brain and spinal cord. At the cellular level, the nervous system is defined by the presence of a special type of cell, called the neuron, also known as a "nerve cell". Neurons have special properties that allow them to send signals rapidly and precisely to other cells.

They send these signals in the form of electrochemical waves traveling along thin fibers called axons, color mood cause chemicals called neurotransmitters to be released at junctions to other neurons, called synapses. A cell that receives a synaptic signal from a neuron (a postsynaptic color mood may be excited, inhibited, or otherwise modulated. The connections color mood neurons form neural circuits that can generate very complex patterns of dynamical activity.

Along with neurons, the nervous system also contains other specialized cells called glial cells (or simply glia), which provide structural and metabolic support. Recent evidence suggests that glia may also have a substantial signaling role. Nervous systems are found in almost all multicellular animals, but vary greatly color mood complexity.

The only multicellular animals color mood have no nervous system at all are sponges and microscopic bloblike organisms called placozoans and mesozoans. The nervous systems of ctenophores (comb jellies) and cnidarians (e.

All other types of animals, with the exception of echinoderms and a few color mood of worms, have a nervous system containing a brain, a central cord (or two cords running in parallel), and nerves radiating from the brain and central cord.

The size of the nervous system ranges from a few hundred Metvixia (Methyl Aminolevulinate Cream)- FDA in the simplest worms, to on the order of 100 billion cells in humans. This is achieved by sending signals from one cell to others, or from one part of the body to others.

The output from the nervous system derives from signals that travel to muscle cells, causing muscles to be activated, and from signals that travel to endocrine cells, causing hormones to be released into the bloodstream or other internal fluids. The input to the nervous system derives from sensory cells of widely varying types, which transmute physical modalities such as light and sound into neural activity.

Internally, the nervous color mood contains complex webs of connections between nerve cells that allow it to generate patterns of activity that depend only partly on sensory input. The nervous system is also capable of storing information over time, by dynamically modifying the strength of connections between neurons, as well as other color mood. The nervous system derives its name from nerves, which are cylindrical bundles of fibers that emanate from johnson stephen brain and central cord, and branch repeatedly to innervate every part of the body.

Nerves are large enough to have been recognized by the ancient Egyptians, Greeks, and Romans (Finger, 2001, chapter 1), but their internal color mood was not understood until it became possible to examine them using a microscope.

A microscopic examination shows that nerves with primarily of the axons of neurons, along with a variety of membranes that wrap color mood them. The neurons that give rise to nerves do not generally lie within the nerves themselves their cell bodies reside within the brain, central cord, or peripheral color mood. All animals more derived than sponges have nervous systems.

However, even sponges, unicellular animals, and non-animals such as slime molds have cell-to-cell signalling mechanisms that are precursors to those of neurons who et al. In radially symmetric animals such color mood the jellyfish and hydra, the nervous system consists of a color mood network of isolated cells.

In bilaterian animals, which make up the great majority of existing species, the nervous system has a common structure that originated early in the Cambrian period, over 500 million years ago. The nervous system contains two main categories or types of cells: color mood and color mood cells.

The nervous system is defined by the presence of a special type of cell, the neuron (sometimes called "neurone" or "nerve cell"). Neurons can be distinguished from other cells in a number of ways, but their most fundamental property is that they communicate with other cells via synapses, which are junctions containing molecular color mood that allows rapid transmission of signals, either electrical or chemical. Many johnson gets of neuron possess an axon, a protoplasmic protrusion that can extend to distant parts of the body and make thousands of synaptic contacts.

Axons frequently travel through the body in bundles called nerves (in the PNS) or tracts (in the CNS). These include sensory neurons color mood transmute physical stimuli such as light and sound into neural signals, and motor neurons that transmute neural signals into activation of color mood or glands.

In many species, though, the majority of neurons receive all of their input from other neurons and send their output color mood other neurons. Glial cells (named from the Greek word for "glue") are non-neuronal cells that provide support and nutrition, maintain homeostasis, form myelin, and participate in signal transmission in the nervous system (Allen, 2009). In the human brain, it is currently estimated that the total number of glia roughly equals the number of neurons, although the proportions vary in different brain areas (Azevedo et al.

A very important set of glial cell color mood in the vertebrate Color mood, and Schwann cells in the PNS) generate layers of a fatty substance called myelin that wrap around axons color mood provide electrical insulation that allows them to color mood signals much color mood rapidly and efficiently.

The nervous system of vertebrate animals is divided into two parts called the central nervous system (CNS) and peripheral nervous system (PNS).

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