Structural and Functional Features of Each Cardiac Chamber

External Morphology of the Right Atrium

The right atrium is one of the four cardiac chambers, primarily responsible for receiving deoxygenated blood from the systemic circulation. It has several key anatomical landmarks that contribute to its structural and functional characteristics.

Key External Features

• Right Auricle: A muscular pouch that increases atrial capacity.
• Superior and Inferior Vena Cava Openings: Allow venous blood return from the body.
• Coronary Sinus Opening: Facilitates drainage from the heart's venous system.
• Crista Terminalis: A ridge separating smooth and rough atrial walls.

Functional Role

The right atrium ensures efficient blood flow into the right ventricle through the tricuspid valve. Its ability to accommodate changes in venous return supports cardiac preload regulation.