Cardiovascular: Anatomy - Coronary arteries Flashcards
Five branches of the RCA
- Sinoatrial nodal
- R conus artery
- Marginal branches
- Posterior interventricular artery/posterior descending artery
- AV nodal
Sinoatrial nodal branch: RCA vs LCA?
60% RCA; 40% LCx
R conus artery supply
Anterior RV, anterior pulmonary conus
Marginal branches of RCA supply
Inferior border of heart (RV and apex)
Origin of RCA
R aortic sinus
Origin of LCA
L aortic sinus
Course of LCA
Between pulmonary trunk and LAA
Course of RCA
Between ascending aorta and RAA
Terminal branches of LCA
- Anterior interventricular/left anterior descending
2. Left circumflex
Branches of anterior interventricular
- Left conus
2. Diagonal branch
Branches of left circumflex
- Marginal branches
Left circumflex supply
Diaphragmatic surface
Coronary artery dominance definition and %
Defined by the vessel which gives rise to the posterior descending artery
67% right heart dominant; 15% left heart dominant; 18% co-dominant
What % of individuals have an accessory coronary artery?
~4%
Describe the venous drainage of the heart
Via coronary sinus (which runs R to L in the posterior coronary sulcus) to the RA
Three main tributaries: great, middle and small cardiac vein
Where does the great cardiac vein run, what does it drain and where does it enter the coronary sinus?
Starts as anterior interventricular vein, runs with LAD then LCx before entering L edge of coronary sinus
Drains areas of heart supplied by the LCA
Where does the middle cardiac vein run, what does it drain and where does it enter the coronary sinus?
Runs with PDA, entering the coronary sinus in the middle position
Together with the small cardiac vein, it drains areas of heart supplied by the RCA
Where does the small cardiac vein run, what does it drain and where does it enter the coronary sinus?
Runs with R marginal artery, entering coronary sinus in R edge just prior to RA
Together with the middle cardiac vein, it drains areas of heart supplied by the RCA
