# What is the butt muscle called?

The butt muscle is called the gluteus maximus. Gray's Anatomy (1918) describes it as the largest and most superficial of the three gluteal muscles.

## What it means

- The largest and most superficial of the three gluteal muscles.
- Gives the buttocks their rounded shape.
- Straightens the hip and rotates the thigh outward.

## Action steps

1. Over the back of the pelvis and upper thigh.
2. Arises from the ilium, sacrum, and coccyx.
3. Inserts into the iliotibial tract and the back of the femur.

## Sources

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

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