The internal surface of the left atrium is notable for:
its generally smooth endocardial surface; this is the result of most of the left atrium originating embryologically from the pulmonary veins
the interatrial septum:
passes obliquely, posteriorly from right to left across the cavity of the chamber
often, a lunate depression is visible; this corresponds to the ostium secundum of the developing heart
the narrow aperture leading to the auricle; as with the right atrial auricle, musculi pectinati line its surface; however, the ridges are less well developed than in the right atrium
veins entering into the chamber:
pulmonary veins, typically two on each side entering in the superior part of the chamber; there are no valves at the intersection of each vein with the chamber
Add information to this page that would be handy to have on hand during a consultation, such as a web address or phone number. This information will always be displayed when you visit this page