Morphological central nervous system abnormality Abnormal CNS myelination HP:0002520 In the CNS, myelin is the product of oligodendrocytes (and not of Schwann cells, as in the PNS). This term refers to an abnormality of the process in which myelin sheaths are formed and maintained around neurons or the result of such an abnormality. HP:0004335 Abnormal formation of myelin sheaths 2012-03-12T07:24:42Z human_phenotype HP:0011400 UMLS:C4021152 peter An abnormality of myelination of nerves in the central nervous system. Abnormal myelination