Right atrial appendage

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Right atrial appendage
Heart seen from above.
Section of the heart showing the ventricular septum. (Left auricula labeled at upper right.)
Latin auricula dextra
Gray's p.533

The right atrial appendage (RAA) (also known as the right auricular appendix, right auricula or right auricle) is a small conical muscular pouch attached to the right atrium of the heart.


See also: Right atrium

Its margins present a dentated edge. It projects from the upper and front part of the sinus forward and toward the left side, overlapping the root of the aorta.

The right auricle, along with the right atrial body, is lined with pectinate muscles that form a network of hills and furrows that give it a trabeculated surface.


The right atrium pumps all deoxygenated blood received in it from the body into the right ventricle.

Clinical significance[edit]

It is possible for tachycardia to emerge from this structure.

Rupture is rare.


In older texts, the term "right auricle" was often used to describe the structure now known as the right atrium.

Additional Images[edit]

See also[edit]