Auricular appendage

Auricular Appendage

The auricular appendage is a term used in anatomy to describe a small, conical, muscular projection from the upper and front part of either atrium of the heart. It is also commonly referred to as the atrial appendage or auricle.

Structure[edit | edit source]

The auricular appendage is a small pouch-like structure that projects from the atria of the heart. The structure of the auricular appendage varies between the left and right atria. The left atrial appendage is smaller and more muscular, while the right atrial appendage is larger and more trabeculated.

Function[edit | edit source]

The primary function of the auricular appendage is to increase the capacity of the atrium and to slightly increase the volume of blood that it can hold. It also plays a role in the cardiac cycle, particularly during the phase of atrial systole.

Clinical significance[edit | edit source]

The auricular appendage is clinically significant as it is a common site for the formation of thrombi in conditions such as atrial fibrillation. Thrombi formed in the auricular appendage can dislodge and cause embolic events, such as stroke.