White matter is one of two types of tissue in the
nervous system. It forms the deep parts of the
brain and the superficial parts of the
spinal cord. It is composed of nerve cells processes (
axons and
dendrites) that connect various parts of the brain to each other and carry nerve impulses to or from the bodies of nerve cells (
neuron). It differs from
gray matter in that its neurons are covered with
myelin.
Do not confuse with dark matter.