1. Greyish nervous tissue containing cell bodies as well as fibers; forms the cerebral cortex consisting of unmyelinated neurons
   "The grey substance of the brain is responsible for processing information";
   - grey matter [Brit, Cdn], gray matter [US], gray substance [US], substantia grisea

Derived forms: grey substances

Type of: nerve tissue, nervous tissue

Part of: cerebral cortex, cerebral mantle, cortex, pallium

Encyclopedia: Grey substance