| medullated | <anatomy> Furnished with a medulla or marrow, or with a medullary sheath; as, a medullated nerve fibre. Source: Websters Dictionary (01 Mar 1998) |
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| medullated nerve fibre | An axon enveloped by a myelin sheath formed by oligodendroglia cells (in brain and spinal cord) or Schwann cells (in peripheral nerves). Synonym: medullated nerve fibre. (05 Mar 2000) |
| medullation | 1. Acquiring, or the act of formation of, marrow or medulla. Synonym: myelination. (05 Mar 2000) |