Grey matter is nerve tissue that primarily consists of nerve cell bodies, dendrites, and unmyelinated axons, thus having a gray appearance.
That would be gray matter.
gray matter
Gray Matter
Gray Matter Interactive was created in 1994.
Gray Matter Interactive ended in 2005.
Gray Matter - band - was created in 1983.
Gray Matter - band - ended in 1993.
Gray matter is what you call the nerve tissue in your brain because the cells are gray in color.
White Matter
gray matter
Gray matter and white matter are essentially the same in the brain and spinal cord. The gray matter is the part of the brain and spinal cord that initiate the firing of neurons and the white matter is basically the mode of transportation for the signal.
The prefix "polio-" means gray matter or gray substance, particularly referring to the gray matter of the brain or spinal cord.