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The Info List - Coronary Artery





The coronary arteries are the arteries of the coronary circulation that transport blood into and out of the cardiac muscle. They are mainly composed of the left and right coronary arteries both of which give off branches. The left coronary artery, arises from the aorta above the left cusp of the aortic valve and feeds blood to the left side of the heart. It branches into two arteries and sometimes a third branch is formed at the fork, known as a ramus or intermediate artery.[1] The right coronary artery, originates from above the right cusp of the aortic valve. It travels down the right coronary sulcus, towards the crux of the heart. There is also the conus artery, which is only present in about 45 per cent of the human population, and which may provide collateral blood flow to the heart when the left anterior descending artery is occluded.[2][3]

Contents

1 Clinical significance 2 Name etymology 3 Additional images 4 References

Clinical significance[edit] Main article: Coronary artery disease Either or both arteriosclerosis and atherosclerosis, can cause one or more of the coronary arteries or their branches to become seriously blocked. Coronary artery bypass surgery
Coronary artery bypass surgery
can be performed to bypass the blockages. The coronary arteries can constrict as a response to various stimuli, mostly chemical. This is known as a coronary reflex. There is also a rare condition known as spontaneous coronary artery dissection. Name etymology[edit]

Radiant crown

Model of human heart

The word corona is a Latin word meaning "crown", from the Ancient Greek κορώνη (korōnè, “garland, wreath”).

Additional images[edit]

Cast of coronary arteries. Right - yellow, left - red 

References[edit]

^ Fuster, V; Alexander RW; O'Rourke RA (2001). Hurst's The Heart
Heart
(10th ed.). McGraw-Hill. p. 53. ISBN 0-07-135694-0.  ^ Wynn GJ, Noronha B, Burgess MI (2008). "Functional significance of the conus artery as a collateral to an occluded left anterior descending artery demonstrated by stress echocardiography". International Journal of Cardiology. 140 (1): e14–5. doi:10.1016/j.ijcard.2008.11.039. PMID 19108914.  ^ Schlesinger MJ, Zoll PM, Wessler S (1949). "The conus artery: a third coronary artery". American Heart
Heart
Journal. 38 (6): 823–38. doi:10.1016/0002-8703(49)90884-4. PMID 15395916. 

v t e

Anatomy of the heart

General

Surface

base apex sulci

coronary interatrial anterior interventricular posterior interventricular

borders

right left

Internal

atria

interatrial septum pectinate muscles terminal sulcus

ventricles

interventricular septum trabeculae carneae chordae tendineae papillary muscle

valves cusps atrioventricular septum

cardiac skeleton intervenous tubercle

Chambers

Right heart

(venae cavae, coronary sinus) → right atrium (atrial appendage, fossa ovalis, limbus of fossa ovalis, crista terminalis, valve of inferior vena cava, valve of coronary sinus) → tricuspid valve → right ventricle (infundibulum, 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

Endocardium

heart valves

Myocardium

Conduction system

cardiac pacemaker SA node Bachmann's bundle AV node bundle of His bundle branches Purkinje fibers

Pericardial cavity

pericardial sinus

Pericardium

fibrous pericardium

sternopericardial ligaments

serous pericardium

epicardium/visceral layer

fold of left vena cava

Blood
Blood
supply

Circulatory system Coronary circulation Coron

.