# What is synovial fluid?

The joint fluid is called the synovial fluid. Gray's Anatomy (1918) describes it as a viscous, egg-white-like fluid.

## What it means

- A viscous, egg-white-like fluid.
- Produced by the synovial membrane lining a joint capsule.
- Lubricates the joint and nourishes the cartilage.

## Action steps

1. Fills the cavity of every synovial joint.
2. Held in place by the fibrous capsule.
3. A very thin film in a healthy joint.

## Sources

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

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