coronary circulation Flashcards
(28 cards)
coronary arteries
left and right
arise from left and right aortic sinuses within aorta
aortic sinuses
small openings within aorta behind left and right flaps of aortic valve
when heart is relaxed, back flow of blood fills valve pockets - blood enters coronary arteries
left coronary artery
LCA
branches into left anterior descending/anterior interventricular artery
left marginal artery and left circumflex artery (left posterior surface)
~20-25% of individuals - LCX contributes to posterior interventricular artery
right coronary artery
branches to form right marginal artery anteriorly
~80-85% individuals - branches into posterior interventricular artery posteriorly
cardiac veins
blood travels from subendocardium into thebesian veins
thebesian veins
small tributaries running through myocardium - drain into larger veins emptying into coronary sinus
coronary sinus
main vein of heart
posterior surface in coronary sulcus (running between left atrium and ventricle)
sinus drainage
into right atrium
opening of coronary sinus is between right AV orifice and IVC orificed
five tributaries draining into coronary sinus
great cardiac vein small cardiac vein middle cardiac vein left marginal vein left posterior ventricular vein
great cardiac vein
originates at apex, follows anterior interventricular groove into coronary sulcus, around left heart to join coronary sinus
small cardiac vein
anterior surface
passes around right side of heart to join coronary sinus
middle cardiac vein
posterior surface of heart
left marginal vein
left posterior side
left posterior ventricular vein
centre - runs along posterior interventricular sulcus to join coronary sinus
RCA
passes to right of pulmonary trunk
runs along coronary sulcus before branching
right marginal artery
arises from RCA, moves along right and inferior border of the heart towards apex
posterior RCA
continues to posterior surface, along coronary sulcus - posterior interventricular artery arises from RCA, follows posterior interventricular groove towards apex
LCA
passes between left side of pulmonary trunk and left auricle
divides into anterior interventricular branch (LAD) and circumflex branch
LAD
follows anterior interventricular groove towards apex, continues on posterior surface to anastomose with posterior interventricular branch
LCX
follows coronary sulcus to left border and onto posterior surface - left marginal branch, follows left border
RCA supply
supplies RA and RV
SA and AV nodes
posterior part of IVS
RMA supply
supplies RV and apex
LAD supply
supplies RV, LV and anterior 2/3 interventricular septum
LMA supply
supplies LV
