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Posterolateral Wall of Left Atrium
Cardiovascular System

Posterolateral Wall of Left Atrium

Paries posterolateralis atrii sinistri

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The heart wall windows follow the standard cuts that are made in anatomy dissections to visualize the internal structures and features of the atria and ventricles. The posterolateral wall of the left atrium illustrates cuts that are made on the posterior surface of the heart following the borders of the auricle.

The structures visible when this wall is reflected include:

- the valve of the foramen ovale on the interatrial septum;

- the opening into the left auricle;

- the opening of the left atrioventricular valve (mitral valve) and its two semilunar leaflets.

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Left Atrium

ScienceDirect image

The LAA is an embryonic remnant of the left atrium (LA) consisting of a long tubular body with walls as little as 1mm thick, usually multilobulated and trabeculated, that communicates with the LA through an oval orifice.

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