n. The insulating envelope of myelin that surrounds the core of a nerve fiber or axon and facilitates the transmission of nerve impulses.
is the insulatory coating which covers some neurons in the central nervous system interrupted at gaps in-between sheaths which are called Nodes of Ranvier. Myelin sheaths are sleeves of fatty tissue that protect your nerve cells. The sheath is formed by the cell membranes of glial cells (SCHWANN CELLS in the peripheral and OLIGODENDROGLIA in the central nervous system). myelin sheath synonyms, myelin sheath pronunciation, myelin sheath translation, English dictionary definition of myelin sheath. Myelin is a layered tissue that surrounds the nerve fibers (axons). Myelin sheath definition, a wrapping of myelin around certain nerve axons, serving as an electrical insulator that speeds nerve impulses to muscles and other effectors. What does myelin sheath mean? 1. Definition of myelin sheath in the Definitions.net dictionary. (layer surrounding a neuron) (fisiologia) guaina mielinica nf sostantivo femminile: Identifica un essere, un oggetto o un concetto che assume genere femminile: scrittrice, aquila, lampada, moneta, felicità Meaning of myelin sheath. Myelin Sheath Definition The myelin sheath is a fatty insulating later that surrounds the nerve cells of jawed vertebrates, or gnathostomes . myelin definition: 1. a substance containing a lot of fat that forms a covering around nerves, especially those in the…. Myelin – the protective coating around nerve fibers in the central nervous system – is a primary target of the immune attack in MS. The myelin sheath is a greatly extended and modified plasma membrane wrapped around the nerve axon in a spiral fashion [ 1 ]. Myelin: The fatty substance that covers and protects nerves. Define myelin sheath. All extant members of the Gnathostomata, from fish to humans, have a myelin sheath on the axon of their nerve cells. MYELIN SHEATH: "The myelin sheath is a coating of myelin of some neurons which allows the process of saltatory conduct." Information and translations of myelin sheath in the most comprehensive dictionary definitions resource on the web.
Learn more. The myelin membranes originate from and are a part of the Schwann cells in the peripheral nervous system (PNS) and the oligodendroglial cells in the central nervous system (CNS) (see Chap. Myelin (n.). myelin [mi´ĕ-lin] the lipid substance forming a sheath (the myelin sheath) around the axons of certain nerve fibers; it is an electrical insulator that serves to speed the conduction of nerve impulses in these nerve fibers, which are called myelinated or medullated fibers.
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