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Grey matter is found in clusters of neurons in the brain and spinal cord, and in cortical layers that line their surfaces.
There is an anatomical convention that a cluster of neurons in the brain or spinal cord is called a nucleus, whereas a cluster of neurons in the periphery is called a ganglion.
The PNS is divided into a) somatic and b) autonomic nervous system, and c) the enteric nervous system. The autonomic nervous system is further subdivided into the sympathetic and the parasympathetic nervous systems.
The sympathetic nervous system is activated in cases of emergencies to mobilize energy, while the parasympathetic nervous system is activated when organisms are in a relaxed state.
Nerves are large enough to have been recognized by the ancient Egyptians, Greeks, and Romans, but their internal structure was not understood until it became possible to examine them using a microscope.
"It is difficult to believe that until approximately year 1900 it was not known that neurons are the basic units of the brain (Santiago Ram? Equally surprising is the fact that the concept of chemical transmission in the brain was not known until around 1930 (Henry Hallett Dale) and (Otto Loewi).
Nervous tissue first arose in wormlike organisms about 550 to 600 million years ago.
In vertebrate species it consists of two main parts, the central nervous system (CNS) and the peripheral nervous system (PNS). The PNS consists mainly of nerves, which are enclosed bundles of the long fibers or axons, that connect the CNS to every other part of the body.
White matter includes all of the nerves, and much of the interior of the brain and spinal cord.Nerves that transmit signals from the brain are called motor or efferent nerves, while those nerves that transmit information from the body to the CNS are called sensory or afferent.Most nerves serve both functions and are called mixed nerves.Abe (H16), Ronaldo - fotbal, Intel, Magazín Klocher.sk, Krása & Relax CZ/SK, Top4Football, Snowbitch.cz, Milujeme Spartu, Priznania Stopexárov, Juraj ŠOKO Tabaček, Tuči Thug, UNILAD, HERB, Ab Normální, David stallone, NOIZZfood.sk, Psychopat Bejr - Jediná oficiální fanpage, SvětŽivě.cz, Milujem weed love, FEŤÁK SULÍK, Brigády Trnava, Poppy Tattoo, Stredná priemyselná škola Trnava, Komenského 1, Síla myšlení, BBtrener, Tattoo Studio Emily, Priznania SPŠ TT, Dnes obúvam, The Real Michael Jai White, Finalistka Miss Universe SR 2016 - Andrea Ridošková, Zabudnuté miesta, Priznania z vlaku, Dog fashion Elli, Trenčín, Chloë Grace Moretz (@Chloe GMoretz), Reinkarnacia.sk, Zlý Hipster, Moma Horňáková, Aranburu, Florballife.cz, Discoluna Nitra, Mr.SINGLE, ME-GA SPORT, NEZAHUČÍŠ NEDÁŠ, Inzercia Aukcie Bazár, Robek, My Virtual Girlfriend - A dating game for Iphone, Ipad and Android, English, Etelka.cz-online filmy, Sajfa, Chceme Sajfu späť vo Fun rádiu, Bongo - What does Bongo know about you?