white matter
US /ˈwaɪt ˌmæt.ər/
UK /ˈwaɪt ˌmæt.ər/

1.
materia blanca
the paler tissue of the brain and spinal cord, consisting mainly of nerve fibers with their myelin sheaths.
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Damage to the white matter can impair cognitive function.
El daño a la materia blanca puede afectar la función cognitiva.
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The MRI scan revealed abnormalities in the patient's white matter.
La resonancia magnética reveló anomalías en la materia blanca del paciente.