Left margin of heart
Encyclopedia
The left margin of heart (or obtuse margin) is shorter than the right border of heart, full, and rounded: it is formed mainly by the left ventricle
, but to a slight extent, above, by the left atrium
.
It extends from a point in the second left intercostal space
, about 2.5 mm. from the sternal margin, obliquely downward, with a convexity to the left, to the apex of the heart
.
Left ventricle
The left ventricle is one of four chambers in the human heart. It receives oxygenated blood from the left atrium via the mitral valve, and pumps it into the aorta via the aortic valve.-Shape:...
, but to a slight extent, above, by the left atrium
Left atrium
The left atrium is one of the four chambers in the human heart. It receives oxygenated blood from the pulmonary veins, and pumps it into the left ventricle, via the mitral valve.-Foramen ovale:...
.
It extends from a point in the second left intercostal space
Intercostal space
The intercostal space is the space between two ribs . Since there are 12 ribs on each side, there are 11 intercostal spaces, each numbered for the rib superior to it.-Structures in intercostal space:* several kinds of intercostal muscle...
, about 2.5 mm. from the sternal margin, obliquely downward, with a convexity to the left, to the apex of the heart
Apex of the heart
The apex of the heart is the lowest superficial part of the heart.It is directed downward, forward, and to the left, and is overlapped by the left lung and pleura.-External anatomy:...
.