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medulla 音標拼音: [mɪd'ʌlə] [mɪd'ulə] n. 骨髓,髓質,延髓 骨髓,髓質,延髓 medulla n 1: a white fatty substance that forms a medullary sheath around the axis cylinder of some nerve fibers [ synonym: { myelin}, { myeline}, { medulla}] 2: 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" [ synonym: { medulla oblongata}, { medulla}, { bulb}] 3: the inner part of an organ or structure in plant or animal [ ant: { cortex}] Medulla \ Me* dul" la\, n. [ L.] 1. Marrow; pith; hence, essence. [ Obs.] -- Milton. [ 1913 Webster] 2. ( Anat.) The marrow of bones; the deep or inner portion of an organ or part; as, the medulla, or medullary substance, of the kidney; specifically, the medula oblongata. [ 1913 Webster] 3. ( Bot.) A soft tissue, occupying the center of the stem or branch of a plant; pith. [ 1913 Webster] 4. See { medulla oblongata}. [ PJC] { Medulla oblongata}. [ L., oblong medulla] ( Anat.), the posterior part of the brain connected with the spinal cord. It includes all the hindbrain except the cerebellum and pons, and from it a large part of the cranial nerves arise. It controls very largely respiration, circulation, swallowing, and other functions, and is the most vital part of the brain; -- called also { bulb of the spinal cord}. See { Brain}. [ 1913 Webster] |
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