Brain white matter is brain tissue comprised of nerve fibers (axons) and myelin, which gives it a distinct color.
Understanding Brain White Matter
Here's a detailed look at what constitutes brain white matter:
- Nerve Fibers (Axons): These are extensions of nerve cells (neurons), responsible for transmitting signals throughout the brain and body.
- Myelin: Myelin is a fatty substance that surrounds many of these nerve fibers.
Role of Myelin
According to the reference, myelin plays two critical roles:
- Color: "Myelin gives the white matter its color." The presence of myelin is what distinguishes white matter from grey matter in the brain.
- Protection: Myelin "protects the nerve fibers from injury." It acts as an insulator, speeding up signal transmission and safeguarding the axons.
In summary, brain white matter is composed of nerve fibers coated in myelin, which not only gives it its characteristic white appearance but also insulates and protects these fibers.
