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medulla
Nounmedulla has 3 senses
myelin, myeline, medulla - a white fatty substance that forms a medullary sheath around the axis cylinder of some nerve fibers --1is a kind offat --1is a substance of medullary sheath, myelin sheath
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" --2is a kind ofneural structure --2is a part of brainstem, brain-stem, brain stem --2has parts: respiratory center