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    medulla

    medulla - Dictionary definition and meaning for word medulla

    Definition
    (noun) a white fatty substance that forms a medullary sheath around the axis cylinder of some nerve fibers
    Synonyms : myelin , myeline
    Definition
    (noun) lower or hindmost part of the brain; continuous with spinal cord; (`bulb' is an old term for medulla oblongata)
    Synonyms : bulb , medulla oblongata
    Example Sentence
    • the medulla oblongata is the most vital part of the brain because it contains centers controlling breathing and heart functioning
    Definition
    (noun) the inner part of an organ or structure in plant or animal
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