white matter http://upload.wikimedia.org/wikipedia/commons/d/d7/Grey_matter_and_white_matter_-_very_high_mag.jpg https://upload.wikimedia.org/wikipedia/commons/d/d2/Spinal_nerve.svg nlx_anat_101177 seems to have been lost in the transition from NIFGA to Neurolex uberon FMA:83929 neuronames:2870 substantia alba white mater MA:0001135 TAO:0000145 EMAPA:35927 NLXANAT:101177 Neural tissue consisting of myelinated axons connecting grey matter areas of the central nervous system. white substance TAO:0002143 AEO:0001011 TAO:0002142 white matter of neuraxis UBERON:0002316 neuronal white matter CNS tract/commissure CNS tracts and commissures CNS white matter UMLS:C0682708 PBA:294022044 VHOG:0001764 NCIT:C33892 Multi-tissue structure comprised largely of myelinated axons.[TAO] Wikipedia:White_matter HBA:9218 NLX:412 ZFA:0001682 AEO:0000139 Cell part cluster consisting predominantly of neurites in the brain and the spinal cord[FMA:83929]. MESH:D066127 The myelination of axons by glial cells was the last major step in the evolution of cells in the vertebrate nervous system, and white-matter tracts are key to the architecture of the mammalian brain.[well established][VHOG] multi cell part structure