# What is white matter?

The white matter is called the white matter. Gray's Anatomy (1918) describes it as the nervous tissue made mostly of myelinated nerve fibers.

## What it means

- The nervous tissue made mostly of myelinated nerve fibers.
- Its color comes from the fatty myelin sheath around the fibers.
- Carries signals between different regions of gray matter.

## Action steps

1. Lies deep to the gray matter of the cerebrum and cerebellum.
2. Forms the outer part of the spinal cord.
3. Bundled into tracts and commissures.

## Sources

- [Gray's Anatomy of the Human Body (1918)](https://www.bartleby.com/107/)

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