The atrioventricular septum is a

septum In biology, a septum (Latin for ''something that encloses''; plural septa) is a wall, dividing a cavity or structure into smaller ones. A cavity or structure divided in this way may be referred to as septate. Examples Human anatomy * Interatri ...

of the heart between the right atrium (RA) and the left ventricle (LV). 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.

Clinical relevance

In some cases, defects can be identified with an echocardiogram. Incomplete formation of the endocardial cushions can lead to atrioventricular septal defects, such as an ostium primum defect.

References

External links

* https://web.archive.org/web/20091030081540/http://www.acc.org/membership/community/pediatric/opinion_apr03/Slide11.JPG {{Authority control Cardiac anatomy

Structure

Development

Clinical relevance

See also

References

External links