# What is the upper arm bone called?

The upper arm bone is called the humerus. Gray's Anatomy (1918) describes it as the single long bone of the upper arm.

## What it means

- The single long bone of the upper arm.
- Has a rounded head at the top, a shaft, and two condyles at the elbow.
- The head is a smooth hemisphere covered with cartilage.

## Action steps

1. Between the shoulder and the elbow.
2. Its head fits into the glenoid cavity of the scapula.
3. Its lower end meets the radius and ulna at the elbow joint.

## Sources

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

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