Left border of heart

  (Redirected from Left margin)

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.

Left border of heart
Sternocostal surface of heart.
Heart seen from above.
LatinMargo obtusus
Anatomical terminology

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 page 528 of the 20th edition of Gray's Anatomy (1918)

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