The right border of the heart (right margin of heart) is a long border on the surface of the

heart The heart is a muscular Organ (biology), organ found in humans and other animals. This organ pumps blood through the blood vessels. The heart and blood vessels together make the circulatory system. The pumped blood carries oxygen and nutrie ...

, and is formed by the right atrium. * The ''atrial portion'' is rounded and almost vertical; it is situated behind the third, fourth, and fifth right costal cartilages about 1.25 cm. from the margin of the

sternum The sternum (: sternums or sterna) or breastbone is a long flat bone located in the central part of the chest. It connects to the ribs via cartilage and forms the front of the rib cage, thus helping to protect the heart, lungs, and major bl ...

. * The ''ventricular portion'', thin and sharp, is named the ''acute margin''; it is nearly horizontal, and extends from the sternal end of the sixth right coastal cartilage to the apex of the heart.

References

External links

Cardiac anatomy {{Portal bar, Anatomy