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Left Auricle of Heart
Cardiovascular System

Left Auricle of Heart

Auricula sinistra cortis

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The left auricle (or atrial appendage) is a pectinated muscular structure which forms a distinctive pouch visible on the exterior of the heart and overlaps the pulmonary trunk.

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Related parts of the anatomy

Key Features/Anatomical Relations

The left auricle is longer in comparison to the right auricle, but it's narrower, and its pectinate muscles are smaller. Due to the narrower passageway, it is a common location of blood clots.


The left auricle is a remnant of the fetal left atrium. The auricles can relieve high atrial pressure by increasing the atrial capacity at times of stress, acting as overflow vessels.

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Left Atrial Appendage

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The left atrial appendage is a remnant of the primitive atrium that protrudes from the postero-lateral aspect of the left atrium.

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