# What is the shoulder joint?

The the shoulder joint is called the glenohumeral joint. Gray's Anatomy (1918) describes it as a ball-and-socket synovial joint.

## What it means

- A ball-and-socket synovial joint.
- Formed where the head of the humerus meets the shallow glenoid cavity of the scapula.
- The most freely movable joint in the body.

## Action steps

1. Between the upper arm and the trunk.
2. Reinforced by the tendons of the rotator cuff muscles.
3. Held in place mainly by muscles, since the socket is very shallow.

## Sources

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

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