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Atrioventricular septum

Wall of the heart chambers

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Although the name "atrioventricular septum" implies any septum between an atrium and a ventricle, in practice the divisions from RA to RV and from LA to LV are mediated by valves, not by septa. Also, there is usually no communication between the LA and the RV.

Structure

It has a membranous and muscular part.

When considering only the membranous septum, it is also known as the "atrioventricular component of the membranous septum".

Development

It is formed by the union of the dorsal AV cushion and ventral AV cushion. This septum divides the atrioventricular canal.

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