Definition of Matter, gray
Matter, gray: The cortex of the brain, which contains nerve cell bodies. The gray matter is so named because it is darker than the white matter, the part of the brain that contains myelinated nerve fibers.Source: MedTerms™ Medical Dictionary
Last Editorial Review: 3/30/2012
Medical Dictionary Definitions A - Z
Search Medical Dictionary
Brain and Nervous System Resources
- How Well Are You Living With AFib?
- How Well Are You Managing Your MS?
- Soothe Your Child's Cold or Flu