medulla

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medulla Definition

• (n) a white fatty substance that forms a medullary sheath around the axis cylinder of some nerve fibers
• (n) 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"
• (n) the inner part of an organ or structure in plant or animal

medulla Synonyms

• bulb
• medulla
• medulla oblongata
• myelin
• myeline