20 Mar gray matter

The cortex parts of the brain are gray in color because of the profusion of neurons and their dendrites with grayish membranes. White matter is white because of myelin. The word cortex is often used synonymously with the cerebrum, but, in fact, the cerebellum has cortex also.
Keywords: cortex
dendrite
white matter
gyrus
sulcus
References: brain physiology
neurons
neuroscience