Noun medulla has 3 senses
  1. myelin, myeline, medulla - a white fatty substance that forms a medullary sheath around the axis cylinder of some nerve fibers
    --1 is a kind of fat
    --1 is a substance of medullary sheath, myelin sheath
  2. medulla oblongata, medulla, bulb - lower or hindmost part of the brain; continuous with spinal cord; (`bulb' is an old term for medulla oblongata); "the medulla oblongata is the most vital part of the brain because it contains centers controlling breathing and heart functioning"
    --2 is a kind of neural structure
    --2 is a part of brainstem, brain-stem, brain stem
    --2 has parts: respiratory center
  3. medulla - the inner part of an organ or structure in plant or animal
    --3 is a kind of
    animal tissue; plant tissue
    Antonyms: cortex
    --3 has particulars: adrenal medulla
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