# What is the chest muscle called?

The chest muscle is called the pectoralis major. Gray's Anatomy (1918) describes it as a large, fan-shaped muscle covering the front of the upper chest.

## What it means

- A large, fan-shaped muscle covering the front of the upper chest.
- Has a clavicular head above and a sternal head below.
- Pulls the arm across the chest and rotates it inward.

## Action steps

1. On the front of the chest.
2. Arises from the clavicle, sternum, and upper costal cartilages.
3. Inserts into the front of the humerus.

## Sources

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

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