Heart - LO 6

6. Identify the unique structures of the left atrium.

The left atrium receives the pulmonary veins from the lungs.

Auricle (appendage): muscular pouch that is located in the superior, left border (often overlapping the root of the pulmonary trunk)

Internally, has pectinate muscles
- Only area of the internal L. atrium with pectinate muscle (the rest is mostly smooth-walled)

L. atrioventricular (mitral) valve orifice

The L. AV valve is located between the L. atrium and L. ventricle

Interatrial septum

Wall between the R. and L. atrium

Semilunar depression: a small depression in the interatrial septum that represents the floor of the fossa ovalis

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