Right atrial appendage

Infobox Anatomy
Name = PAGENAME
Latin = auricula dextra
GraySubject = 138
GrayPage = 529


Caption = Heart seen from above. (Right auricula labeled at upper right.)

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Caption2 = Sternocostal surface of heart. (Right auricula visible at upper left.)
System =
Precursor =
MeshName =
MeshNumber =
DorlandsPre = a_73
DorlandsSuf = 12169666
The right atrial appendage (RAA) (right auricular appendix, right auricula, right auricle)cite journal |author=Gong D, Zhang Y, Cai B, "et al" |title=Characterization and Comparison of Na, K(+) and Ca(2+) Currents Between Myocytes from Human Atrial Right Appendage and Atrial Septum |journal=Cell. Physiol. Biochem. |volume=21 |issue=5-6 |pages=385–394 |year=2008 |pmid=18453746 |doi=10.1159/000129631 |url=http://content.karger.com/produktedb/produkte.asp?typ=fulltext&file=000129631] is a small conical muscular pouch attached to the right atrium of the heart.

Anatomy

Its margins present a dentated edge. It projects from the upper and front part of the sinus forward and toward the left side, overlapping the root of the aorta.

The right auricle, along with the right atrial body, is lined with pectinate muscles that form a network of hills and furrows that give it a trabeculated surface.

Terminology

In older texts, the term "right auricle" was often used to describe the structure now known as the right atrium.

Clinical significance

It is possible for tachycardia to emerge from this structure.cite journal |author=Freixa X, Berruezo A, Mont L, "et al" |title=Characterization of focal right atrial appendage tachycardia |journal=Europace |volume=10 |issue=1 |pages=105–9 |year=2008 |month=January |pmid=18077484 |doi=10.1093/europace/eum264 |url=http://europace.oxfordjournals.org/cgi/pmidlookup?view=long&pmid=18077484] cite journal |author=Zhang T, Li XB, Wang YL, "et al" |title=Focal atrial tachycardia arising from the right atrial appendage: electrophysiologic and electrocardiographic characteristics and catheter ablation |journal=Int. J. Clin. Pract. |volume= |issue= |pages= |year=2007 |month=November |pmid=18005038 |doi=10.1111/j.1742-1241.2007.01489.x |url=http://dx.doi.org/10.1111/j.1742-1241.2007.01489.x]

Rupture is rare.cite journal |author=Figueiredo AM, Poggetti RS, Quintavalle FG, "et al" |title=Isolated right atrial appendage (RAA) rupture in blunt trauma--a case report and an anatomic study comparing RAA and right atrium (RA) wall thickness |journal=World J Emerg Surg |volume=2 |issue= |pages=5 |year=2007 |pmid=17302990 |doi=10.1186/1749-7922-2-5 |url=http://www.wjes.org/content/2//5]

References

ee also

* Left atrial appendage

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