Left margin of heart: Information from Answers.com

Left margin of heart

Sternocostal surface of heart.

Heart seen from above.
Gray's	subject #138 528

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.

External links

MedEd at Loyola medicine/pulmonar/cxr/atlas/silouhette2.htm

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 As such, some of the information contained herein may be outdated.

v • d • e Anatomy of torso, cardiovascular system: heart

Structures	atria (interatrial septum, musculi pectinati) · ventricles (interventricular septum, trabeculae carneae, chordae tendineae, papillary muscle) · valves · cusps

Regions	base · apex · grooves (coronary/atrioventricular, interatrial, anterior interventricula, posterior interventricular) · surfaces (sternocostal, diaphragmatic) · borders (right, left)

Right heart	(vena cavae, coronary sinus) → right atrium (atrial appendage, fossa ovalis, limbus of fossa ovalis, crista terminalis, valve of the inferior vena cava, valve of the coronary sinus) → tricuspid valve → right ventricle (conus arteriosus, moderator band/septomarginal trabecula) → pulmonary valve → (pulmonary artery and pulmonary circulation)

Left heart	(pulmonary veins) → left atrium (atrial appendage) → mitral valve → left ventricle → aortic valve (aortic sinus) → (aorta and systemic circulation)

Layers	pericardium: fibrous pericardium · serous pericardium (pericardial cavity, epicardium/visceral layer) · pericardial sinus myocardium · endocardium · cardiac skeleton (fibrous trigone, fibrous rings)

Conduction system	Cardiac pacemaker · SA node · AV node• bundle of His · Purkinje fibers

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