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Right Atrial Appendage
Extends from the RA drapes over the aortic root and is triangular shaped wtih a large oriface.
The lateral right and atrial walls and right atrial appendage are usually composed of these muscles - while the rest of the RA walls have a smooth surface
The IVC has a rudimentary valve formed by tissue fold called this. (the svc doesn't have this valve)
The right coronary and non coronary cusp of the aortic valve lie up against the medial right atrial wall - this forms a small bulge (the torus aorticus)
guarded by a flap of tissue which forms a rudimentary valve called the thebesian valve
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