Adjustment of the myelin sheath to changes in axon caliber.
D000818:Animals; D001369:Axons / Q000502:physiology*; D003250:Constriction; D008853:Microscopy; D008854:Microscopy, Electron; D009186:Myelin Sheath / Q000166:cytology / Q000502:physiology*; D009410:Nerve Degeneration; D009413:Nerve Fibers, Myelinated; D009474:Neurons / Q000502:physiology*; D051381:Rats; D011919:Rats, Inbred Strains; D012584:Sciatic Nerve / Q000502:physiology*