Blood Supply & Innervation of the Heart Flashcards
what do the coronary arteries supply?
myocardium and epicardium
*w/ oxygenated blood
what do the coronary arteries arise from?
the right and left aortic sinuses
right coronary artery gives rise to…
-sinoatrial nodal artery
-right marginal artery
-posterior interventricular artery
left coronary artery gives rise to…
-circumflex artery
-anterior interventricular artery
coronary arteries are…
functionally end arteries
end artery
only supply of oxygenated blood to a portion of tissue
*no anastomoses
why are the branches of the coronary arteries not true end arteries?
because numerous anastomoses take place b/w the L and R coronary arteries and b/w branches of the same artery
intercoronary anastomoses
b/w coronary arteries
intracoronary anastomoses
b/w branches of the same artery
R coronary artery supplies…
-R atrium
-R ventricle
-posterior 1/3 interventricular septum
-SA and AV nodes
L coronary artery supplies…
-L atrium
-L ventricle
-portion of R ventricle
-anterior 2/3 interventricular septum
-possible SA node (in 40% of population)
R coronary artery runs in _____
coronary sulcus
SA nodal artery supplies…
SA node
R marginal artery supplies…
R ventricle- does not reach apex
coronary artery dominance
defined by the artery that gives rise to the posterior interventricular artery
which dominance of the coronary artery is typical?
right
codominance of coronary arteries
both RCA and LCA give rise to branches that course in or near the posterior interventricular groove occurs very rarely
right dominant hearts have…
better collateral circulation than L dominant