| Left border of heart | |
|---|---|
 Sternocostal surface ofheart. | |
 Heart seen from above. | |
| Details | |
| Identifiers | |
| Latin | margo obtusus |
| Anatomical terminology | |
Theleft border of heart (orobtuse margin) is formed from the rounded lateral wall of theleft ventricle. It is called the 'obtuse' margin because of the obtuse angle (>90 degrees) created between the anterior part of the heart and the left side, which is formed from the rounded lateral wall of the left ventricle. Within this margin can be found theobtuse marginal artery, which is the a branch of theleft circumflex artery.
It extends from a point in the second leftintercostal space, about 2.5 mm. from thesternal margin, obliquely downward, with a convexity to the left, to theapex of the heart.
This is contrasted with theacute margin of the heart, which is at the border of the anterior and posterior surface, and in which theacute marginal branch of theright coronary artery is found. The angle formed here is <90 degrees, therefore an acute angle.
This article incorporates text in thepublic domain frompage 528 of the 20th edition ofGray's Anatomy(1918)
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