Left margin of heart

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Left margin of heart
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Sternocostal surface of heart.
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Heart seen from above.
Gray's subject #138 528
Dorlands/Elsevier m_04/12513824

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]


Overview

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.

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This article was originally based on an entry from a public domain edition of Gray's Anatomy. As such, some of the information contained herein may be outdated. Please edit the article if this is the case, and feel free to remove this notice when it is no longer relevant.



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