Improper laying down or breakdown of a myelin sheath of a nerve fibre, caused by abnormal myelin metabolism. ... (05 Mar 2000) ... 
(dis″mi-ә-lin-a´shәn) breakdown or defective formation of a myelin sheath, usually involving biochemical abnormalities.
Type: Term Pronunciation: dis′mī-ĕ-li-nā′shŭn Definitions: 1. Improper laying down or breakdown of a myelin sheath of a nerve fiber, caused by abnormal myelin metabolism.
dysmyelination Improper laying down or breakdown of a myelin sheath of a nerve fiber, caused by abnormal myelin metabolism.