from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The extensive outer layer of gray matter of the cerebral hemispheres, largely responsible for higher brain functions, including sensation, voluntary muscle movement, thought, reasoning, and memory.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The grey, folded, outermost layer of the cerebrum that is responsible for higher brain processes such as sensation, voluntary muscle movement, thought, reasoning, and memory.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. the layer of unmyelinated neurons (the grey matter) forming the cortex of the cerebrum
Sorry, no etymologies found.
In the cerebral cortex — that is, the thin covering which envelopes the entire surface of the brain — are distinguished various areas, connected by long nerve tracts with the organs of sense, the skin, the muscles, and in fact with the entire surface of the body.
In other cases, a disease process of the blood-vessel system affects also the blood vessels of the brain, and thus injures the cerebral cortex (mental diseases due to the calcification of the blood vessels, arterio-scelerotic psychosis).
The cerebral cortex of a mammal is a sheet of grey matter, wrapped around the outside of the brain.