bʌlb mɛˈdʌlə

ˈmaɪəlɪn 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