med·ul·lat·ed /ˈmɛdḷˌetəd, ˈmɛʤəˌle-/
  (a.)有髓的
  Me·dul·la·ted a. Anat. Furnished with a medulla or marrow, or with a medullary sheath; as, a medullated nerve fiber.
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  medullated
       adj : (of neurons) covered with a layer of myelin [syn: myelinated]
             [ant: unmyelinated]