Myelin-sheath
noun, Anatomy.
1.
a wrapping of myelin around certain nerve axons, serving as an electrical insulator that speeds nerve impulses to muscles and other effectors.
myelin sheath n.
The insulating envelope of myelin that surrounds the core of a nerve fiber or axon and that facilitates the transmission of nerve impulses, formed from the cell membrane of the Schwann cell in the peripheral nervous system and from oligodendroglia cells. Also called medullary sheath.
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[mahy-uh-lahy-tis] /ˌmaɪ əˈlaɪ tɪs/ noun, Pathology. 1. inflammation of the substance of the spinal cord. 2. inflammation of the bone marrow. /ˌmaɪɪˈlaɪtɪs/ noun 1. inflammation of the spinal cord or of the bone marrow myelitis my·e·li·tis (mī’ə-lī’tĭs) n. my’e·lit’ic (-lĭt’ĭk) adj.
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1. a combining form meaning “marrow,” “of the spinal cord,” used in the formation of compound words: myelocyte. before vowels myel-, word-forming element meaning “marrow, spinal cord,” from Greek myelos “marrow; the brain,” of unknown origin. myelo- or myel- pref.
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[mahy-uh-luh-blast] /ˈmaɪ ə ləˌblæst/ noun, Cell Biology. 1. an immature myelocyte. /ˈmaɪələʊˌblɑːst/ noun 1. a cell that gives rise to a granulocyte, normally occurring in the bone marrow but detected in the blood in certain diseases, esp leukaemia myeloblast my·e·lo·blast (mī’ə-lə-blāst’) n. An immature cell of the bone marrow that is the precursor of a […]
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myeloblastemia my·e·lo·blas·te·mi·a (mī’ə-lō-blā-stē’mē-ə) n. The presence of myeloblasts in the circulating blood.
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myeloblastic leukemia my·e·lo·blas·tic leukemia (mī’ə-lə-blās’tĭk) n. A form of granulocytic leukemia characterized by abnormal numbers of myeloblasts in the blood and in various tissues.