Coronary Circulation

Question 1

How many cusps does the aortic valve have?

Answer 1

3 cusps

Question 2

What are the branches supplying the heart?

Answer 2

Left and right coronary arteries

Question 3

Describe the location and route of the right coronary artery

Answer 3

Arises from right aortic sinus
First supplies upper RA
Then runs downward in atrioventricular groove giving off branches to RV (posterior descending + marginal)
Passes along underside of the heart
Terminal branch is right interventricular artery

Question 4

Describe the route of the left coronary artery and the areas it supplies

Answer 4

Arises behind pulmonary trunk from left aortic sinus
Divides into many branches into LV:

• circumflex branch runs onto underside of heart in left
  atrioventricular groove sending further branches to LV
• longest is left iv (or L. anterior descending)

Question 5

What is the coronary sinus ?

Answer 5

The great, middle and small cardiac veins converging into one vein that opens into RA (just below and in front of IVC)

Question 6

What is the difference in texture between veins and arteries?

Answer 6

Arteries thicker more muscular

Veins thinner and wider lumen