Cardiovascular: Anatomy - Coronary arteries

Question 1

Five branches of the RCA

Answer 1

1. Sinoatrial nodal
2. R conus artery
3. Marginal branches
4. Posterior interventricular artery/posterior descending artery
5. AV nodal

Question 2

Sinoatrial nodal branch: RCA vs LCA?

Answer 2

60% RCA; 40% LCx

Question 3

R conus artery supply

Answer 3

Anterior RV, anterior pulmonary conus

Question 4

Marginal branches of RCA supply

Answer 4

Inferior border of heart (RV and apex)

Question 5

Origin of RCA

Answer 5

R aortic sinus

Question 6

Origin of LCA

Answer 6

L aortic sinus

Question 7

Course of LCA

Answer 7

Between pulmonary trunk and LAA

Question 8

Course of RCA

Answer 8

Between ascending aorta and RAA

Question 9

Terminal branches of LCA

Answer 9

1. Anterior interventricular/left anterior descending

2. Left circumflex

Question 10

Branches of anterior interventricular

Answer 10

1. Left conus

2. Diagonal branch

Question 11

Branches of left circumflex

Answer 11

1. Marginal branches

Question 12

Left circumflex supply

Answer 12

Diaphragmatic surface

Question 13

Coronary artery dominance definition and %

Answer 13

Defined by the vessel which gives rise to the posterior descending artery
67% right heart dominant; 15% left heart dominant; 18% co-dominant

Question 14

What % of individuals have an accessory coronary artery?

Answer 14

~4%

Question 15

Describe the venous drainage of the heart

Answer 15

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

Question 16

Where does the great cardiac vein run, what does it drain and where does it enter the coronary sinus?

Answer 16

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

Question 17

Where does the middle cardiac vein run, what does it drain and where does it enter the coronary sinus?

Answer 17

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

Question 18

Where does the small cardiac vein run, what does it drain and where does it enter the coronary sinus?

Answer 18

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