# What is the septum of the heart?

The wall between the heart chambers is called the septum of the heart. Gray's Anatomy (1918) describes it as a muscular wall that divides the heart into left and right sides.

## What it means

- A muscular wall that divides the heart into left and right sides.
- Has an upper part (interatrial septum) between the atria and a lower part (interventricular septum) between the ventricles.
- Prevents mixing of oxygenated and deoxygenated blood.

## Action steps

1. In the middle of the heart.
2. Runs from the base of the heart to the apex.
3. The interventricular part is much thicker than the interatrial part.

## Sources

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

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