| 词汇 | myelin-sheath |
| 释义 | myelin sheath noun[ C ] anatomy specializeduk /ˌmaɪə.lɪn ˈʃiːθ/ us /ˌmaɪə.lɪn ˈʃiːθ/ a layer of myelin(= a substance containing a lot of fat) that surrounds and protects some nerves, especially in the brain: Multiple sclerosis is characterized by inflammation and loss of the myelin sheaths that insulate nerve fibres of the brain and spinal cord. These antibodies can then enter the brain and attack the myelin sheath, disrupting nerve conduction. The nerve cells lose their myelin sheath, which is a covering that helps nerve cells conduct impulses. Children have thinner skulls, and the protective myelin sheaths for nerves in the brain are less developed. Such an autoimmune response against nerve cell myelin sheaths is strongly suspected as the cause of multiple sclerosis. The brain & nervous system abducens nerve abducent nerve accessory nerve alexithymia allism glossopharyngeal nerve grey matter hemispheric hemispherical hindbrain neurogenic neurogenically neuroglia neuroglial neurohormonal reticular formation rhinencephalon rhombencephalon right brain right-brained You can also find related words, phrases, and synonyms in the topics: Substances & structures in the body Synonymmedullary sheath |
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