Left margin of heart

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Left margin of heart
Sternocostal surface of heart.
Heart seen from above.
Latin Margo obtusus
Anatomical terminology

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.


This article incorporates text in the public domain from the 20th edition of Gray's Anatomy (1918)

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