Editing Heart (section)

====Right heart====
{{anchor|Right heart}}
The right heart consists of two chambers, the right atrium and the right ventricle, separated by a valve, the [[tricuspid valve]].<ref name="CNX2014"/>

The right atrium receives blood almost continuously from the body's two major [[vein]]s, the [[Superior vena cava|superior]] and [[Inferior vena cava|inferior]] [[Vena cava|venae cavae]]. A small amount of blood from the coronary circulation also drains into the right atrium via the [[coronary sinus]], which is immediately above and to the middle of the opening of the inferior vena cava.<ref name="CNX2014"/> In the wall of the right atrium is an oval-shaped depression known as the [[fossa ovalis (heart)|fossa ovalis]], which is a remnant of an opening in the fetal heart known as the [[Foramen ovale (heart)|foramen ovale]].<ref name="CNX2014"/> Most of the internal surface of the right atrium is smooth, the depression of the fossa ovalis is medial, and the anterior surface has prominent ridges of [[pectinate muscle]]s, which are also present in the [[right atrial appendage]].<ref name="CNX2014"/>

The right atrium is connected to the right ventricle by the tricuspid valve.<ref name="CNX2014"/> The walls of the right ventricle are lined with [[trabeculae carneae]], ridges of cardiac muscle covered by endocardium. In addition to these muscular ridges, a band of cardiac muscle, also covered by endocardium, known as the [[moderator band]] reinforces the thin walls of the right ventricle and plays a crucial role in cardiac conduction. It arises from the lower part of the interventricular septum and crosses the interior space of the right ventricle to connect with the inferior papillary muscle.<ref name="CNX2014"/> The right ventricle tapers into the [[pulmonary trunk]], into which it ejects blood when contracting. The pulmonary trunk branches into the left and right pulmonary arteries that carry the blood to each lung. The pulmonary valve lies between the right heart and the pulmonary trunk.<ref name="CNX2014"/>