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Myelin

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55: 442:. These myelin-like sheaths share several structural features with the sheaths found in vertebrates including multiplicity of membranes, condensation of membrane, and nodes. However, the nodes in vertebrates are annular; i.e. they encircle the axon. In contrast, nodes found in the sheaths of invertebrates are either annular or fenestrated; i.e. they are restricted to "spots". The fastest recorded conduction speed (across both vertebrates and invertebrates) is found in the ensheathed axons of the 477: 606: 183:) pass along the axon. The myelinated axon can be likened to an electrical wire (the axon) with insulating material (myelin) around it. However, unlike the plastic covering on an electrical wire, myelin does not form a single long sheath over the entire length of the axon. Rather, myelin ensheaths the axon segmentally: in general, each axon is encased in multiple long sheaths with short gaps between, called 459: 706:, along the axon. In 2012, evidence came to light to support a role for the myelinating cell in "feeding" the axon. In other words, the myelinating cell seems to act as a local "fueling station" for the axon, which uses a great deal of energy to restore the normal balance of ions between it and its environment, following the generation of action potentials. 40: 838:), weakness of arms or legs, cognitive disruption, including speech impairment and memory loss, heat sensitivity (symptoms worsen or reappear upon exposure to heat, such as a hot shower), loss of dexterity, difficulty coordinating movement or balance disorder, difficulty controlling bowel movements or urination, fatigue, and tinnitus. 398:), though axons are ensheathed by a type of cell, called glial cells, in invertebrates. These glial wraps are quite different from vertebrate compact myelin, formed, as indicated above, by concentric wrapping of the myelinating cell process multiple times around the axon. Myelin was first described in 1854 by 876:(AChEIs), may have beneficial effects on myelination, myelin repair, and myelin integrity. Increasing cholinergic stimulation also may act through subtle trophic effects on brain developmental processes and particularly on oligodendrocytes and the lifelong myelination process they support. Increasing 361:
into mature oligodendrocytes, which form myelin. In humans, myelination begins early in the 3rd trimester, although only little myelin is present in either the CNS or the PNS at the time of birth. During infancy, myelination progresses rapidly, with increasing numbers of axons acquiring myelin
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When a peripheral fiber is severed, the myelin sheath provides a track along which regrowth can occur. However, the myelin layer does not ensure a perfect regeneration of the nerve fiber. Some regenerated nerve fibers do not find the correct muscle fibers, and some damaged motor neurons of the
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depolarises to approximately +35 mV. Along the myelinated internode, energy-dependent sodium/potassium pumps pump the sodium ions back out of the axon and potassium ions back into the axon to restore the balance of ions between the intracellular (inside the cell, i.e. axon in this case) and
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At the molecular level, the myelin sheath increases the distance between extracellular and intracellular ions, reducing the accumulation of electrical charges. The discontinuous structure of the myelin sheath results in the action potential "jumping" from one node of Ranvier over a long
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results in diverse symptoms determined by the functions of the affected neurons. It disrupts signals between the brain and other parts of the body; symptoms differ from patient to patient, and have different presentations upon clinical observation and in laboratory studies.
536:, which also appear white) each comprise thousands to millions of axons, largely aligned in parallel. Blood vessels provide the route for oxygen and energy substrates such as glucose to reach these fibre tracts, which also contain other cell types including 194:. Saltatory conduction refers to the fact that electrical impulses 'jump' along the axon, over long myelin sheaths, from one node of Ranvier to the next. Thus, information is passed around 100 times faster along a myelinated axon than a non-myelinated one. 410:. In the CNS, non-myelinated axons (or intermittently myelinated axons, meaning axons with long non-myelinated regions between myelinated segments) intermingle with myelinated ones and are entwined, at least partially, by the processes of another type of 833:
Typical symptoms include blurriness in the central visual field that affects only one eye, may be accompanied by pain upon eye movement, double vision, loss of vision/hearing, odd sensation in legs, arms, chest, or face, such as tingling or numbness
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Whilst the role of myelin as an "axonal insulator" is well-established, other functions of myelinating cells are less well known or only recently established. The myelinating cell "sculpts" the underlying axon by promoting the
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Fünfschilling U, Supplie LM, Mahad D, Boretius S, Saab AS, Edgar J, Brinkmann BG, Kassmann CM, Tzvetanova ID, Möbius W, Diaz F, Meijer D, Suter U, Hamprecht B, Sereda MW, Moraes CT, Frahm J, Goebbels S, Nave KA (April 2012).
575:(MPZ or P0) has a similar role to that of PLP in the CNS in that it is involved in holding together the multiple concentric layers of glial cell membrane that constitute the myelin sheath. The primary lipid of myelin is a 2627:
Windrem MS, Nunes MC, Rashbaum WK, Schwartz TH, Goodman RA, McKhann G, Roy NS, Goldman SA (January 2004). "Fetal and adult human oligodendrocyte progenitor cell isolates myelinate the congenitally dysmyelinated brain".
694:, thus increasing the diameter or thickness of the axon at the internodal regions; helps cluster molecules on the axolemma (such as voltage-gated sodium channels) at the node of Ranvier; and modulates the transport of 405:
In vertebrates, not all axons are myelinated. For example, in the PNS, a large proportion of axons are unmyelinated. Instead, they are ensheathed by non-myelinating Schwann cells known as Remak SCs and arranged in
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Makoukji J, Belle M, Meffre D, Stassart R, Grenier J, Shackleford G, Fledrich R, Fonte C, Branchu J, Goulard M, de Waele C, Charbonnier F, Sereda MW, Baulieu EE, Schumacher M, Bernard S, Massaad C (March 2012).
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is decremental by nature, thus nodes of Ranvier have to be (relatively) closely spaced, to secure action potential propagation. The action potential "recharges" at consecutive nodes of Ranvier as the axolemmal
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CNS myelin differs slightly in composition and configuration from PNS myelin, but both perform the same "insulating" function (see above). Being rich in lipid, myelin appears white, hence the name given to the
277:), which only myelinate a section of one axon. In the CNS, axons carry electrical signals from one nerve cell body to another. The "insulating" function for myelin is essential for efficient 791:
awareness. When myelin degrades, conduction of signals along the nerve can be impaired or lost, and the nerve eventually withers. A more serious case of myelin deterioration is called
4161: 672:) node of Ranvier, triggering the opening of the voltage gated sodium channels and entry of sodium ions at this site. Although the sodium ions diffuse through the axoplasm rapidly, 325:. Due to its high prevalence, multiple sclerosis, which specifically affects the central nervous system (brain, spinal cord and optic nerve), is the best known disorder of myelin. 945: 2068:
Saher G, Brügger B, Lappe-Siefke C, Möbius W, Tozawa R, Wehr MC, Wieland F, Ishibashi S, Nave KA (April 2005). "High cholesterol level is essential for myelin membrane growth".
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Myelin's best known function is to increase the rate at which information, encoded as electrical charges, passes along the axon's length. Myelin achieves this by eliciting
760: 2894:"Perturbed interactions of mutant proteolipid protein/DM20 with cholesterol and lipid rafts in oligodendroglia: implications for dysmyelination in spastic paraplegia" 4595: 621:) propagate along the myelinated fiber. In unmyelinated fibers, action potentials travel as continuous waves, but, in myelinated fibers, they "hop" or propagate by 4655: 366:, crawling and walking. Myelination continues through adolescence and early adulthood and although largely complete at this time, myelin sheaths can be added in 784: 93: 3027:
Fields, R. Douglas, "The Brain Learns in Unexpected Ways: Neuroscientists have discovered a set of unfamiliar cellular mechanisms for making fresh memories",
402:, although it was over a century later, following the development of electron microscopy, that its glial cell origin and its ultrastructure became apparent. 787:
secondary to pernicious anaemia can lead to slight peripheral nerve damage to severe damage to the central nervous system, affecting speech, balance, and
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Lee Y, Morrison BM, Li Y, Lengacher S, Farah MH, Hoffman PN, Liu Y, Tsingalia A, Jin L, Zhang PW, Pellerin L, Magistretti PJ, Rothstein JD (July 2012).
4391: 4386: 309:(e.g. acquiring and recalling knowledge), as demonstrated by the consequence of disorders that affect myelination, such as the genetically determined 3980: 3149: 3117: 896:
have been found to promote myelination in mice with damaged facial nerves. Cholesterol is a necessary nutrient for the myelin sheath, along with
4139: 3112: 4147: 3122: 2958: 2486: 776: 748: 4358: 564: 3037:, is now seen as making a contribution to learning by controlling the speed at which signals travel along neural wiring." (p. 79.) 155: 921: 908:
Dysmyelination is characterized by a defective structure and function of myelin sheaths; unlike demyelination, it does not produce
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may play a role in demyelination associated with such diseases, including inflammation causing demyelination by overproduction of
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Miller A, Korem M, Almog R, Galboiz Y (June 2005). "Vitamin B12, demyelination, remyelination and repair in multiple sclerosis".
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or "internode", before "recharging" at the next node of Ranvier. This 'jumping' continues until the action potential reaches the
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Ledeen RW, Chakraborty G (March 1998). "Cytokines, signal transduction, and inflammatory demyelination: review and hypothesis".
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die without regrowth. Damage to the myelin sheath and nerve fiber is often associated with increased functional insufficiency.
265:, each of which sends out processes (limb-like extensions from the cell body) to myelinate multiple nearby axons; while in the 2665: 764: 4363: 950: 881: 873: 853: 637:). It has been suggested that myelin permits larger body size by maintaining agile communication between distant body parts. 187:. At the nodes of Ranvier, which are approximately one thousandth of a mm in length, the axon's membrane is bare of myelin. 3388: 641: 466: 88: 3973: 3383: 3371: 3142: 4058: 3423: 3361: 807: 54: 912:. Such defective sheaths often arise from genetic mutations affecting the biosynthesis and formation of myelin. The 4346: 3418: 768: 657: 563:(MBP), which is abundant in the CNS where it plays a critical, non-redundant role in formation of compact myelin; 4049: 3928: 3778: 3713: 3341: 711: 266: 215: 45: 916:
represents one animal model of dysmyelination. Human diseases where dysmyelination has been implicated include
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sheaths. This corresponds with the development of cognitive and motor skills, including language comprehension,
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Matalon R, Michals-Matalon K, Surendran S, Tyring SK (2006). "Canavan disease: studies on the knockout mouse".
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transplantation), whether this technique can be effective in replacing myelin loss in humans is still unknown.
571:(PLP), which is the most abundant protein in CNS myelin, but only a minor component of PNS myelin. In the PNS, 358: 2802:"Brain Cholesterol Metabolism and Its Defects: Linkage to Neurodegenerative Diseases and Synaptic Dysfunction" 2573:"MRI evidence that docosahexaenoic acid ethyl ester improves myelination in generalized peroxisomal disorders" 1352:"Leukodystrophies: a proposed classification system based on pathological changes and pathogenetic mechanisms" 625:. The latter is markedly faster than the former, at least for axons over a certain diameter. Myelin decreases 551:
In terms of total mass, myelin comprises approximately 40% water; the dry mass comprises between 60% and 75%
4675: 4627: 3966: 3407: 3135: 322: 176: 4062: 4044: 3875: 3402: 3166: 314: 246: 100: 60: 198:(c. 0.1 mm – >1 mm, or 100–1000 micron) myelinated stretch of the axon called the 4351: 4178: 4098: 4053: 3733: 3723: 3658: 826: 731: 630: 470: 1485: 1087:"The Molecular and Morphologic Structures That Make Saltatory Conduction Possible in Peripheral Nerve" 4378: 4334: 4228: 3858: 3755: 3685: 3511: 3366: 2754: 2327: 2270: 2161: 1990:"The role of immune cells, glia and neurons in white and gray matter pathology in multiple sclerosis" 1941:"Multiple sclerosis: a coordinated immunological attack against myelin in the central nervous system" 1755:"Ueber das ausgebreitete Vorkommen einer dem Nervenmark analogen Substanz in den thierischen Geweben" 1717: 1601:"Myelin remodeling through experience-dependent oligodendrogenesis in the adult somatosensory cortex" 1196: 1139: 815: 752: 622: 610: 609:
Action potential propagation in myelinated neurons is faster than in unmyelinated neurons because of
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Unmyelinated fibers and myelinated axons of the mammalian central nervous system do not regenerate.
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Demyelination is the loss of the myelin sheath insulating the nerves, and is the hallmark of some
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Fatty substance that surrounds nerve cell axons to insulate them and increase transmission speed
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Research to repair damaged myelin sheaths is ongoing. Techniques include surgically implanting
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of a cross-section of a myelinated PNS axon, generated at the Electron Microscopy Facility at
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Functionally equivalent myelin-like sheaths are found in several invertebrate taxa, including
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support to the axons. This is because axons, being elongated structures, are too far from the
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is then rapidly restored due to positively charged potassium ions leaving the axon through
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The main purpose of myelin is to increase the speed at which electrical impulses (known as
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is an essential lipid component of myelin, without which myelin fails to form.
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can also develop nerve damage if the condition is not diagnosed quickly.
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ethyl ester improves myelination in generalized peroxisomal disorders.
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Luxol Fast Blue: Modified Kluver's Method to stain for Myelin Sheath
2133:. In Siegel GJ, Agranoff BW, Albers RW, Fisher SK, Uhler MD (eds.). 1754: 1185:"Fire-diffuse-fire model of dynamics of intracellular calcium waves" 1020: 668:), to the adjacent myelinated internode and ultimately to the next ( 652:
can enter the axon through these voltage-gated channels, leading to
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them and increase the rate at which electrical impulses (called
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model for studying human myelination and white matter diseases
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100–120 m/s for the fastest myelinated vertebrate axon).
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The International Journal of Biochemistry & Cell Biology
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along the myelinated internodes, exposing them only at the
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446:, an invertebrate, ranging between 90 and 200 m/s ( 3043:"Seeing Is Believing: Myelin Dynamics in the Adult CNS" 1511:"Seeing Is Believing: Myelin Dynamics in the Adult CNS" 1890:
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of the membrane potential at the node of Ranvier. The
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Myelin is considered a defining characteristic of the
2743:"Lithium enhances remyelination of peripheral nerves" 946:
Lesional demyelinations of the central nervous system
516:" of the CNS. Both CNS white matter tracts (e.g. the 156: 147: 59:
Neuron with oligodendrocyte and myelin sheath in the
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The International Journal of Neuropsychopharmacology
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"What is myelin?". 856:in the central nervous system and inducing 771:, inherited demyelinating diseases such as 345:The process of generating myelin is called 175:(the nervous system's electrical wires) to 135: 4162: 4148: 4140: 3981: 3967: 3959: 3822: 3542: 3535: 3346: 3241: 3171: 3150: 3136: 3128: 2800:Petrov AM, Kasimov MR, Zefirov AL (2016). 1843:"New insights on Schwann cell development" 1550:Hill RA, Li AM, Grutzendler J (May 2018). 53: 38: 4392:Pulmonary surfactant-associated protein C 4387:Pulmonary surfactant-associated protein B 3058: 2999: 2917: 2825: 2776: 2766: 2504: 2437: 2396: 2347: 2290: 2232: 2222: 2181: 2009: 1956: 1915: 1866: 1817: 1729: 1650: 1648: 1646: 1644: 1624: 1575: 1526: 1375: 1318: 1277: 1259: 1218: 1208: 1159: 1102: 814:. MRI evidence that docosahexaenoic acid 682:extracellular (outside the cell) fluids. 583:. The intertwining hydrocarbon chains of 567:(MOG), which is specific to the CNS; and 3041:Swire M, Ffrench-Constant C (May 2018). 2373:"Non-signalling energy use in the brain" 2420:Attwell D, Laughlin SB (October 2001). 1509:Swire M, French-Constant C (May 2018). 996: 2118:(6th ed.). New York: McGraw-Hill. 430:annelids, and crustacean taxa such as 104: 44:Structure of simplified neuron in the 29: 4656:other cell membrane protein disorders 3113:The MS Information Sourcebook, Myelin 321:; and the inflammatory demyelinating 7: 3090:10.1001/archneur.1977.00500220019003 2851:Journal of the Neurological Sciences 1928:– via Elsevier Science Direct. 749:acute disseminated encephalomyelitis 4359:Myelin oligodendrocyte glycoprotein 565:myelin oligodendrocyte glycoprotein 2672:. January 20, 2004. Archived from 1701:Salzer JL, Zalc B (October 2016). 25: 2371:Engl E, Attwell D (August 2015). 281:(i.e. movement such as walking), 2818:10.32607/20758251-2016-8-1-58-73 2439:10.1097/00004647-200110000-00001 633:across the axonal membrane (the 463:Transmission electron micrograph 355:oligodendrocyte progenitor cells 122: 3314:Oligodendrocyte progenitor cell 2002:10.1016/j.pneurobio.2015.02.003 1908:10.1016/j.pneurobio.2008.09.015 1810:10.1016/j.expneurol.2016.06.005 1792:Boullerne AI (September 2016). 874:acetylcholinesterase inhibitors 854:oligodendrocyte precursor cells 4628:Phospholipid transfer proteins 4364:Myelin-associated glycoprotein 2910:10.1523/JNEUROSCI.3581-06.2006 2711:10.1016/j.biopsych.2006.08.020 2131:"Characteristics of Neuroglia" 963:, project to regenerate myelin 951:Myelin-associated glycoprotein 587:strengthen the myelin sheath. 167:-rich material that surrounds 1: 2047:10.1016/S1357-2725(01)00136-4 1958:10.1016/S0092-8674(00)81107-1 1413:10.1016/S0140-6736(08)61620-7 1152:10.1016/S0006-3495(98)77550-2 642:voltage-gated sodium channels 341:Critical period § Myelin 3060:10.1016/j.neuron.2018.05.005 2389:10.1113/jphysiol.2014.282517 1528:10.1016/j.neuron.2018.05.005 1456:10.1097/WCO.0000000000000481 1444:Current Opinion in Neurology 922:Pelizaeus–Merzbacher disease 313:; the acquired inflammatory 4059:Peripheral membrane protein 3424:Postganglionic nerve fibers 2898:The Journal of Neuroscience 1009:Nature Reviews Neuroscience 890:Glycogen synthase kinase 3β 777:Charcot–Marie–Tooth disease 559:. Protein content includes 528:) and PNS nerves (e.g. the 4692: 4347:Myelin proteolipid protein 4050:Integral membrane proteins 3419:Preganglionic nerve fibers 1320:10.1152/physrev.00031.2018 845: 769:central pontine myelinosis 729: 658:resting membrane potential 598: 338: 332: 4651: 3929:Olfactory receptor neuron 3593:Neurofibril/neurofilament 3001:10.1017/S1461145706007334 2863:10.1016/j.jns.2005.03.009 2377:The Journal of Physiology 2211:Frontiers in Neuroscience 2174:10.1016/j.cub.2017.01.025 1731:10.1016/j.cub.2016.07.074 1669:10.1017/S1740925X09990263 1617:10.1038/s41593-018-0121-5 1568:10.1038/s41593-018-0120-6 1368:10.1007/s00401-017-1739-1 1248:Frontiers in Neuroscience 880:cholinergic stimulation, 712:peripheral nervous system 267:peripheral nervous system 99: 52: 37: 2224:10.3389/fnins.2018.00467 1994:Progress in Neurobiology 1896:Progress in Neurobiology 1261:10.3389/fnins.2018.00467 967:Myelin Repair Foundation 555:and between 15% and 25% 4094:Lipid raft/microdomains 2951:10.1007/0-387-30172-0_6 2768:10.1073/pnas.1121367109 2542:10.1023/A:1022493013904 1939:Steinman L (May 1996). 1892:"The astrocyte odyssey" 1794:"The history of myelin" 1210:10.1073/pnas.96.11.6060 765:Guillain–Barré syndrome 640:Myelinated fibers lack 489:Nucleus of Schwann cell 323:peripheral neuropathies 4099:Membrane contact sites 4063:Lipid-anchored protein 4045:Membrane glycoproteins 3876:Neuromuscular junction 3739:III or Aδ or fast pain 2530:Neurochemical Research 1798:Experimental Neurology 870:Cholinergic treatments 614: 508: 473: 315:demyelinating disorder 269:, myelin is formed by 247:central nervous system 101:Anatomical terminology 4179:Cell surface receptor 4054:transmembrane protein 3078:Archives of Neurology 2699:Biological Psychiatry 1356:Acta Neuropathologica 1307:Physiological Reviews 846:Further information: 808:tumor necrosis factor 732:Demyelinating disease 730:Further information: 721:Clinical significance 631:electrical resistance 608: 479: 471:Hartford, Connecticut 461: 339:Further information: 4379:Pulmonary surfactant 4335:Myelin basic protein 4229:Membrane-spanning 4A 4079:Caveolae/Coated pits 3894:Meissner's corpuscle 3859:Postsynaptic density 3756:Efferent nerve fiber 3744:IV or C or slow pain 3686:Afferent nerve fiber 3512:Satellite glial cell 1490:library.med.utah.edu 1085:Carroll, SL (2017). 806:via upregulation of 753:neuromyelitis optica 743:diseases, including 623:saltatory conduction 611:saltatory conduction 601:Saltatory conduction 561:myelin basic protein 378:Species distribution 370:regions such as the 192:saltatory conduction 4369:Myelin protein zero 3899:Merkel nerve ending 3118:H & E Histology 3030:Scientific American 2759:2012PNAS..109.3973M 2589:10.1212/wnl.51.1.26 2479:10.1007/400_2009_19 2340:10.1038/nature11314 2332:2012Natur.487..443L 2283:10.1038/nature11007 2275:2012Natur.485..517F 2166:2017CBio...27.1068B 2114:Saladin KS (2012). 2070:Nature Neuroscience 1722:2016CBio...26.R971S 1657:Neuron Glia Biology 1605:Nature Neuroscience 1556:Nature Neuroscience 1201:1999PNAS...96.6060D 1144:1998BpJ....75..595K 1132:Biophysical Journal 1104:10.1093/jnen/nlx013 1060:"The Myelin Sheath" 892:inhibitors such as 757:transverse myelitis 573:myelin protein zero 569:proteolipid protein 522:corticospinal tract 374:, throughout life. 4104:Membrane nanotubes 3989:Structures of the 3934:Photoreceptor cell 3904:Pacinian corpuscle 3835:Electrical synapse 3789:Lower motor neuron 3784:Upper motor neuron 3505:Internodal segment 3445:Connective tissues 3415:Autonomic ganglion 1859:10.1002/glia.22852 1771:10.1007/BF02116709 1753:Virchow R (1854). 1066:. Lippincott-Raven 971:multiple sclerosis 961:The Myelin Project 781:pernicious anaemia 745:multiple sclerosis 679:membrane potential 662:potassium channels 615: 581:galactocerebroside 509: 474: 364:speech acquisition 319:multiple sclerosis 229:Myelin is made by 200:internodal segment 4663: 4662: 4175:membrane proteins 4137: 4136: 4037:Membrane proteins 3956: 3955: 3952: 3951: 3919:Free nerve ending 3886:Sensory receptors 3814: 3813: 3729:Ib or Golgi or Aα 3637: 3636: 3520: 3519: 3397:Ramus communicans 3336: 3335: 3332: 3331: 3202:Commissural fiber 3197:Association fiber 3192:Projection fibers 2960:978-0-387-30171-6 2943:N-Acetylaspartate 2488:978-3-642-03018-5 2129:Raine CS (1999). 1996:. 127–128: 1–22. 1407:(9648): 1502–17. 738:neurodegenerative 619:action potentials 297:, the feeling of 208:neurotransmitters 181:action potentials 115: 114: 110: 16:(Redirected from 4683: 4164: 4157: 4150: 4141: 4119:Nuclear envelope 4114:Nodes of Ranvier 3983: 3976: 3969: 3960: 3849:Synaptic vesicle 3844:Chemical synapse 3823: 3543: 3536: 3347: 3242: 3172: 3152: 3145: 3138: 3129: 3101: 3072: 3062: 3014: 3013: 3003: 2979: 2973: 2972: 2938: 2932: 2931: 2921: 2904:(45): 11743–52. 2889: 2883: 2882: 2846: 2840: 2839: 2829: 2797: 2791: 2790: 2780: 2770: 2737: 2731: 2730: 2694: 2688: 2685: 2683: 2681: 2676:on June 14, 2011 2661: 2624: 2618: 2615: 2609: 2608: 2568: 2562: 2561: 2525: 2519: 2518: 2508: 2458: 2452: 2451: 2441: 2417: 2411: 2410: 2400: 2383:(16): 3417–329. 2368: 2362: 2361: 2351: 2326:(7408): 443–48. 2311: 2305: 2304: 2294: 2269:(7399): 517–21. 2253: 2247: 2246: 2236: 2226: 2202: 2196: 2195: 2185: 2145: 2139: 2138: 2126: 2120: 2119: 2111: 2102: 2101: 2065: 2059: 2058: 2030: 2024: 2023: 2013: 1985: 1979: 1978: 1960: 1936: 1930: 1929: 1919: 1887: 1881: 1880: 1870: 1838: 1832: 1831: 1821: 1804:(Pt B): 431–45. 1789: 1783: 1782: 1750: 1744: 1743: 1733: 1707: 1698: 1689: 1688: 1652: 1639: 1638: 1628: 1596: 1590: 1589: 1579: 1547: 1541: 1540: 1530: 1506: 1500: 1499: 1497: 1496: 1482: 1476: 1475: 1439: 1433: 1432: 1396: 1390: 1389: 1379: 1347: 1341: 1340: 1322: 1298: 1292: 1291: 1281: 1263: 1239: 1233: 1232: 1222: 1212: 1180: 1174: 1173: 1163: 1123: 1117: 1116: 1106: 1082: 1076: 1075: 1073: 1071: 1055: 1049: 1048: 1004: 918:leukodystrophies 894:lithium chloride 646:nodes of Ranvier 311:leukodystrophies 283:sensory function 263:oligodendrocytes 214:, which bind to 185:nodes of Ranvier 159: 154: 153: 150: 149: 146: 143: 140: 137: 134: 131: 128: 107:edit on Wikidata 57: 42: 30: 21: 4691: 4690: 4686: 4685: 4684: 4682: 4681: 4680: 4666: 4665: 4664: 4659: 4647: 4601:Neurofibromin 2 4584:Other/ungrouped 4579: 4396: 4373: 4321: 4223: 4190: 4168: 4138: 4133: 4067: 4031: 3999:Membrane lipids 3993: 3987: 3957: 3948: 3880: 3810: 3759: 3750: 3734:II or Aβ and Aγ 3689: 3680: 3633: 3623:Apical dendrite 3618:Dendritic spine 3597: 3559: 3529: 3516: 3500:Node of Ranvier 3495:Myelin incisure 3467: 3439: 3328: 3319:Oligodendrocyte 3302:Ependymal cells 3283: 3233: 3161: 3156: 3109: 3104: 3075: 3040: 3023: 3021:Further reading 3018: 3017: 2981: 2980: 2976: 2961: 2940: 2939: 2935: 2891: 2890: 2886: 2848: 2847: 2843: 2799: 2798: 2794: 2753:(10): 3973–78. 2739: 2738: 2734: 2696: 2695: 2691: 2679: 2677: 2664: 2630:Nature Medicine 2626: 2625: 2621: 2616: 2612: 2570: 2569: 2565: 2527: 2526: 2522: 2489: 2460: 2459: 2455: 2432:(10): 1133–45. 2419: 2418: 2414: 2370: 2369: 2365: 2313: 2312: 2308: 2255: 2254: 2250: 2204: 2203: 2199: 2154:Current Biology 2147: 2146: 2142: 2128: 2127: 2123: 2113: 2112: 2105: 2067: 2066: 2062: 2032: 2031: 2027: 1987: 1986: 1982: 1938: 1937: 1933: 1889: 1888: 1884: 1840: 1839: 1835: 1791: 1790: 1786: 1752: 1751: 1747: 1716:(20): R971–75. 1710:Current Biology 1705: 1700: 1699: 1692: 1654: 1653: 1642: 1598: 1597: 1593: 1549: 1548: 1544: 1508: 1507: 1503: 1494: 1492: 1484: 1483: 1479: 1441: 1440: 1436: 1398: 1397: 1393: 1349: 1348: 1344: 1313:(3): 1381–431. 1300: 1299: 1295: 1241: 1240: 1236: 1195:(11): 6060–63. 1182: 1181: 1177: 1125: 1124: 1120: 1084: 1083: 1079: 1069: 1067: 1057: 1056: 1052: 1021:10.1038/nrn2148 1006: 1005: 998: 993: 956:Myelin incisure 942: 930:phenylketonuria 926:Canavan disease 906: 878:oligodendrocyte 850: 844: 824: 793:Canavan disease 779:. People with 734: 728: 723: 698:structures and 688:phosphorylation 603: 597: 544:in the CNS and 526:corpus callosum 507: 467:Trinity College 456: 424: 385: 380: 372:cerebral cortex 353:. In the CNS, 343: 337: 331: 271:neurolemmocytes 157: 125: 121: 111: 63: 48: 28: 23: 22: 15: 12: 11: 5: 4689: 4687: 4679: 4678: 4676:Neurohistology 4668: 4667: 4661: 4660: 4652: 4649: 4648: 4646: 4645: 4640: 4635: 4630: 4625: 4620: 4619: 4618: 4613: 4603: 4598: 4593: 4587: 4585: 4581: 4580: 4578: 4577: 4572: 4567: 4562: 4557: 4552: 4547: 4542: 4537: 4532: 4527: 4522: 4517: 4512: 4507: 4502: 4497: 4492: 4487: 4482: 4477: 4472: 4467: 4462: 4457: 4452: 4447: 4442: 4437: 4432: 4427: 4422: 4417: 4412: 4406: 4404: 4398: 4397: 4395: 4394: 4389: 4383: 4381: 4375: 4374: 4372: 4371: 4366: 4361: 4356: 4355: 4354: 4344: 4343: 4342: 4331: 4329: 4323: 4322: 4320: 4319: 4314: 4309: 4304: 4299: 4294: 4289: 4284: 4279: 4274: 4269: 4264: 4259: 4254: 4249: 4244: 4239: 4233: 4231: 4225: 4224: 4222: 4221: 4216: 4211: 4206: 4200: 4198: 4192: 4191: 4169: 4167: 4166: 4159: 4152: 4144: 4135: 4134: 4132: 4131: 4126: 4124:Phycobilisomes 4121: 4116: 4111: 4106: 4101: 4096: 4091: 4086: 4084:Cell junctions 4081: 4075: 4073: 4069: 4068: 4066: 4065: 4056: 4047: 4041: 4039: 4033: 4032: 4030: 4029: 4024: 4019: 4014: 4009: 4003: 4001: 3995: 3994: 3988: 3986: 3985: 3978: 3971: 3963: 3954: 3953: 3950: 3949: 3947: 3946: 3944:Taste receptor 3941: 3936: 3931: 3926: 3921: 3916: 3914:Muscle spindle 3911: 3909:Ruffini ending 3906: 3901: 3896: 3890: 3888: 3882: 3881: 3879: 3878: 3873: 3871:Ribbon synapse 3868: 3863: 3862: 3861: 3856: 3851: 3841: 3831: 3829: 3820: 3816: 3815: 3812: 3811: 3809: 3808: 3807: 3806: 3801: 3796: 3786: 3781: 3776: 3771: 3765: 3763: 3752: 3751: 3749: 3748: 3747: 3746: 3741: 3736: 3731: 3726: 3716: 3711: 3706: 3701: 3695: 3693: 3691:Sensory neuron 3682: 3681: 3679: 3678: 3677: 3676: 3666: 3661: 3659:Pseudounipolar 3656: 3651: 3645: 3643: 3639: 3638: 3635: 3634: 3632: 3631: 3630: 3629: 3627:Basal dendrite 3620: 3615: 3607: 3605: 3599: 3598: 3596: 3595: 3590: 3585: 3580: 3578:Axon terminals 3575: 3569: 3567: 3561: 3560: 3558: 3557: 3551: 3549: 3540: 3533: 3522: 3521: 3518: 3517: 3515: 3514: 3509: 3508: 3507: 3502: 3497: 3492: 3477: 3475: 3469: 3468: 3466: 3465: 3460: 3455: 3449: 3447: 3441: 3440: 3438: 3437: 3432: 3430:Nerve fascicle 3427: 3421: 3412: 3411: 3410: 3405: 3393: 3392: 3391: 3386: 3376: 3375: 3374: 3369: 3364: 3353: 3351: 3344: 3338: 3337: 3334: 3333: 3330: 3329: 3327: 3326: 3321: 3316: 3311: 3310: 3309: 3299: 3293: 3291: 3285: 3284: 3282: 3281: 3276: 3271: 3266: 3261: 3256: 3250: 3248: 3239: 3235: 3234: 3232: 3231: 3226: 3221: 3220: 3219: 3214: 3209: 3204: 3199: 3194: 3184: 3178: 3176: 3169: 3163: 3162: 3159:Nervous tissue 3157: 3155: 3154: 3147: 3140: 3132: 3126: 3125: 3120: 3115: 3108: 3107:External links 3105: 3103: 3102: 3084:(10): 585–89. 3073: 3038: 3024: 3022: 3019: 3016: 3015: 2974: 2959: 2933: 2884: 2857:(1–2): 93–97. 2841: 2792: 2732: 2705:(4): 294–301. 2689: 2687: 2686: 2619: 2610: 2563: 2520: 2487: 2453: 2412: 2363: 2306: 2248: 2197: 2160:(7): 1068–73. 2140: 2121: 2103: 2082:10.1038/nn1426 2060: 2025: 1980: 1951:(3): 299–302. 1931: 1882: 1853:(8): 1376–93. 1833: 1784: 1745: 1690: 1640: 1611:(5): 696–706. 1591: 1542: 1501: 1477: 1434: 1391: 1342: 1293: 1234: 1175: 1138:(2): 595–600. 1118: 1077: 1050: 995: 994: 992: 989: 988: 987: 977: 974:drug discovery 964: 958: 953: 948: 941: 938: 914:shiverer mouse 905: 904:Dysmyelination 902: 843: 840: 823: 820: 773:leukodystrophy 727: 724: 722: 719: 692:neurofilaments 654:depolarisation 629:and increases 599:Main article: 596: 593: 534:auditory nerve 506: 505: 500: 495: 490: 487: 481: 455: 452: 423: 420: 400:Rudolf Virchow 384: 381: 379: 376: 351:myelinogenesis 335:Myelinogenesis 333:Main article: 330: 327: 279:motor function 224:secretory cell 113: 112: 103: 97: 96: 91: 85: 84: 80: 79: 78:Nervous system 76: 70: 69: 65: 64: 58: 50: 49: 43: 35: 34: 26: 24: 14: 13: 10: 9: 6: 4: 3: 2: 4688: 4677: 4674: 4673: 4671: 4658: 4657: 4650: 4644: 4641: 4639: 4636: 4634: 4631: 4629: 4626: 4624: 4621: 4617: 4614: 4612: 4609: 4608: 4607: 4604: 4602: 4599: 4597: 4594: 4592: 4589: 4588: 4586: 4582: 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4122: 4120: 4117: 4115: 4112: 4110: 4109:Myelin sheath 4107: 4105: 4102: 4100: 4097: 4095: 4092: 4090: 4087: 4085: 4082: 4080: 4077: 4076: 4074: 4070: 4064: 4060: 4057: 4055: 4051: 4048: 4046: 4043: 4042: 4040: 4038: 4034: 4028: 4025: 4023: 4022:Sphingolipids 4020: 4018: 4015: 4013: 4012:Phospholipids 4010: 4008: 4007:Lipid bilayer 4005: 4004: 4002: 4000: 3996: 3992: 3991:cell membrane 3984: 3979: 3977: 3972: 3970: 3965: 3964: 3961: 3945: 3942: 3940: 3937: 3935: 3932: 3930: 3927: 3925: 3922: 3920: 3917: 3915: 3912: 3910: 3907: 3905: 3902: 3900: 3897: 3895: 3892: 3891: 3889: 3887: 3883: 3877: 3874: 3872: 3869: 3867: 3864: 3860: 3857: 3855: 3852: 3850: 3847: 3846: 3845: 3842: 3840: 3836: 3833: 3832: 3830: 3828: 3824: 3821: 3817: 3805: 3804:γ motorneuron 3802: 3800: 3799:β motorneuron 3797: 3795: 3794:α motorneuron 3792: 3791: 3790: 3787: 3785: 3782: 3780: 3777: 3775: 3772: 3770: 3767: 3766: 3764: 3762: 3757: 3753: 3745: 3742: 3740: 3737: 3735: 3732: 3730: 3727: 3725: 3722: 3721: 3720: 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3975:t 3968:v 3837:/ 3758:/ 3688:/ 3625:/ 3528:/ 3426:) 3417:( 3151:e 3144:t 3137:v 3100:. 3088:: 3071:. 3057:: 3012:. 2998:: 2971:. 2949:: 2930:. 2908:: 2881:. 2861:: 2838:. 2816:: 2810:8 2789:. 2765:: 2757:: 2729:. 2709:: 2684:. 2660:. 2640:: 2607:. 2587:: 2560:. 2540:: 2517:. 2477:: 2450:. 2436:: 2409:. 2387:: 2360:. 2338:: 2330:: 2303:. 2281:: 2273:: 2245:. 2221:: 2194:. 2172:: 2164:: 2100:. 2080:: 2074:8 2057:. 2045:: 2022:. 2000:: 1977:. 1955:: 1906:: 1879:. 1857:: 1830:. 1808:: 1781:. 1769:: 1763:6 1742:. 1728:: 1720:: 1687:. 1667:: 1661:4 1637:. 1615:: 1588:. 1566:: 1539:. 1525:: 1498:. 1474:. 1454:: 1431:. 1411:: 1388:. 1366:: 1339:. 1317:: 1290:. 1258:: 1231:. 1207:: 1199:: 1172:. 1150:: 1142:: 1115:. 1101:: 1074:. 1047:. 1019:: 1013:8 976:. 920:( 834:( 613:. 512:" 394:( 273:( 249:( 151:/ 148:n 145:ɪ 142:l 139:ə 136:. 130:m 127:ˈ 124:/ 120:( 109:] 20:)

Index

Myelination

PNS

CNS
System
FMA
62977
Anatomical terminology
edit on Wikidata
/ˈm.əlɪn/
MY-ə-lin
lipid
nerve
axons
insulate
action potentials
nodes of Ranvier
saltatory conduction
internodal segment
axon terminal
neurotransmitters
synapse
receptors
myocyte
secretory cell
glial cells
nutritional
homeostatic
soma

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