medulla : | |||||||||||||
the inner part of an organ or structure in plant or animal 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" a white fatty substance that forms a medullary sheath around the axis cylinder of some nerve fibers |
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