Right atrial appendage

Last revised by Francis Deng on 31 Oct 2021

The right atrial appendage, also known as the right auricule (TA) or auricle, is a trapezoidal pouch forming the anterosuperior part of the right atrium. Pacemaker/defibrillator leads are often placed at this site.

Gross anatomy

The right atrial appendage is delineated from the rest of the right atrium (the right atrial vestibule) by the crista terminalis. The structure wraps leftward and upward over the anterior surface of the aortic root 1. The proximal antral part and the distal saccular part are divided by the tenia sagittalis and the walls are lined by pectinate muscles 2

Related pathology

The right atrial appendage may be the site of the following clinically important entities 1:

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