The left border of heart (or left margin, or obtuse margin) is shorter than the
right border, 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
The sternum 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 blood vessels from injury. Sh ...
, obliquely downward, with a convexity to the left, to the
apex of the heart.
References
External links
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Cardiac anatomy
{{Portal bar, Anatomy