Right atrial appendage
|Right atrial appendage|
|Heart seen from above.|
|Section of the heart showing the ventricular septum. (Left auricula labeled at upper right.)|
|Gray's||subject #138 533|
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.
In older texts, the term "right auricle" was often used to describe the structure now known as the right atrium.
Additional Images 
Clinical significance 
It is possible for tachycardia to emerge from this structure.
Rupture is rare. The right auricle pumps all deoxygenated blood received in it from the body into the right ventricle.
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