What does the right atrium look like?

The right atrium is a chamber of the heart that is typically depicted as a triangular or crescent-shaped structure. It has thin walls and a smooth interior, with features like the pectinate muscles giving it a textured appearance. It receives deoxygenated blood from the body through the superior and inferior vena cavae and directs it into the right ventricle through the tricuspid valve. Its size and shape may vary slightly depending on individual anatomy and health conditions.