单词	myelin sheath
释义	myelin sheath noun : the insulating covering that surrounds an axon with multiple spiral layers of myelin, that is discontinuous at the nodes of Ranvier, and that increases the speed at which a nerve impulse can travel along an axon called also medullary sheath Example Sentences Recent Examples on the Web In earlier work, Hauser and his colleagues found that the tissue damage in MS is primarily directed by B cells, which attack the myelin sheath protecting nerves. Lydia Denworth, Scientific American, 13 Jan. 2022 In this case, your immune system mistakenly attacks your myelin and damages the myelin sheath. Sara Gaynes Levy, SELF, 7 Mar. 2022 In the case of MS, the body attacks its myelin sheath, a protective covering for the nerves in the brain and spinal cord. Jocelyn Solis-moreira, Health.com, 21 Jan. 2022 In the disease, inflammation damages the myelin sheath that insulates nerve cells, ultimately disrupting signals to and from the brain and causing a variety of symptoms, from numbness and pain to paralysis. Lydia Denworth, Scientific American, 13 Jan. 2022 The mutations may damage the nerves or damage the myelin sheath, the protective coating that surrounds the nerve. Korin Miller, Health.com, 28 Sep. 2021 Without the myelin sheath, signals that go through a nerve are slowed or lost, which causes the nerve to malfunction. Aarti Sarwal, The Conversation, 7 July 2020 Both widening of the nodal gap and thinning of the myelin sheath slow the speed of impulse transmission. R. Douglas Fields, Scientific American, 12 Mar. 2020 When the protective covering on nerve fibers (also known as the myelin sheath) is worn away from this damage, the nerves don't work how they're supposed to, causing communication errors between the brain and body. Amy Marturana Winderl, SELF, 1 Mar. 2020 See More Word History First Known Use 1891, in the meaning defined above Medical Definition myelin sheath noun : the insulating covering that surrounds an axon with multiple spiral layers of myelin, that is discontinuous at the nodes of Ranvier, and that increases the speed at which a nerve impulse can travel along an axon called also medullary sheath
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