Right atrium — Free Anatomy Illustration

Anatomy

Right atrium

Isolated human right atrium shown as the thin-walled upper right chamber of the heart, with a rounded to somewhat boxy-oval pouch-like shape, broad superior venous inlet region, and slightly tapered inferior aspect. The muscular wall is muted pink-red to reddish-brown. It has a broad hollow cavity with generally smooth internal contours, including a smoother posterior or septal region, while the external contour is smooth overall. An anterior ear-shaped auricular appendage projects from the chamber as a softer wrinkled but more ridged muscular flap. Major anatomical openings are indicated in simplified form, including the superior vena cava, inferior vena cava, coronary sinus, and tricuspid orifice, emphasizing its role as a venous receiving chamber.

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