medulla

Noun
  1. A white fatty substance that forms a medullary sheath around the axis cylinder of some nerve fibers (synset 114982032)
    is a type of: fat - a soft greasy substance occurring in organic tissue and consisting of a mixture of lipids (mostly triglycerides)
    substance meronym: medullary sheath, myelin sheath - a layer of myelin encasing (and insulating) the axons of medullated nerve fibers
    same as: myelin, myeline
  2. Lower or hindmost part of the brain;
    Continuous with spinal cord;
    (`bulb' is an old term for medulla oblongata) (synset 105502823)
    "the medulla oblongata is the most vital part of the brain because it contains centers controlling breathing and heart functioning"
    is a type of: neural structure - a structure that is part of the nervous system
    has: respiratory center - the center in the medulla oblongata and pons that integrates sensory information about the level of oxygen and carbon dioxide in the blood and determines the signals to be sent to the respiratory muscles
    is a part of: brain stem, brain-stem, brainstem - the part of the brain continuous with the spinal cord and comprising the medulla oblongata and pons and midbrain and parts of the hypothalamus
    same as: bulb, medulla oblongata
  3. The inner part of an organ or structure in plant or animal (synset 105498451)
    is a type of:
    subtypes: adrenal medulla - the medulla of the adrenal gland; secretes epinephrine

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