Gray Matter
gray
The pyramids are made of limestone blocks with a white exterior. Over time, the blocks have weathered and appear more gray in certain areas.
A horn is the gray matter of the spinal cord, and a column consist of white matter.
That would be gray matter.
gray matter
no the report says normal gray white differentiation
The white matter is located on the outside of the gray matter in the spinal cord.
The brainstem contains both white and gray matter. White matter is found on the inside, made up of myelinated nerve fibers, while gray matter is located on the outside and consists of nerve cell bodies.
It is superficial to the white matter.
gray matter
Myelination
Gray matter doesn't fit. White matter is white because it has myelin covering the axons. And the myelin fiber tract is "white" for the same reason.