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Noun: medulla (medullae,medullas)  mi'dú-lu
  1. A white fatty substance that forms a medullary sheath around the axis cylinder of some nerve fibers
    - myelin, myeline
  2. Lower or hindmost part of the brain; continuous with spinal cord
    "the medulla oblongata is the most vital part of the brain because it contains centres controlling breathing and heart functioning";
    - medulla oblongata, bulb [archaic]
  3. The inner part of an organ or structure in plant or animal

Derived forms: medullae, medullas

Type of: animal tissue, fat, neural structure, plant tissue

Antonym: cortex

Part of: brain stem, brainstem, brain-stem, medullary sheath, myelin sheath

Encyclopedia: Medulla, Florida