Arteriole supply of the heart

Question 1

Arterial supply of the heart

Answer 1

Coronary arteries

Question 2

Coronary arteries

Answer 2

• First branch of the ascending aorta

Question 3

First part of the aorta

Answer 3

Ascending aorta

Question 4

Where does the ascending aorta begin?

Answer 4

Aortic valve

Question 5

Where is the ascending aorta located

Answer 5

obliquely and just to the left of the midline at the level of 3rd intercostal space

Question 6

Where does the ascending aorta end?

Answer 6

terminates as it exits the fibrous pericardium at the sternal angle

Question 7

How many branches does the ascending aorta Have?

Answer 7

Normally only has two branches - R and L coronary artery

Question 8

Where do the 2 branches of the ascending aorta originate from?

Answer 8

[R and L coronary artery]
they arise from the right and the left aortic sinuses. Which are outperchings of the aortic wall, above each cusp of the aortic valve

Question 9

Question 10

What do the coronary arteries supply?

Answer 10

Supply the atria and ventricles
- Myocardium
- Epicardium

Question 11

the atrial branches of the coronary arteries are usually ______ and not ________

Answer 11

small
readily apparent in a cadaver heart

Question 12

Question 13

Left coronary artery pathway

Answer 13

• Arises from the left aortic sinus
• Passes between the left oracle and the left side of the pulmonary trunk
• Also runs in the coronary sulcus
• Short artery before it splits and branches at the superior end of the anterior inter-ventricular groove, into a circumflex branch and anterior inter ventricular branch

Question 13

Right coronary artery pathway

Answer 13

• Arises from the right aortic sinus of the ascending aorta
• passes to the right of the pulmonary trunk running in the coronary sulcus

Question 14

Question 15

What does the left coronary artery supply

Answer 15

The left atrium, most of the left ventricle, parts of the right ventricle, most of the inter ventricular septum (including the AV bundle of the conducting system of the heart) and the SA node in +/- 40% of people

Question 16

Question 17

Question 18

Question 19

Cardiac dominance/ coronary arteriole dominance

Answer 19

Defined by the vessel which gives rise to the posterior interventricular artery which supplies the myocardium of the inf. 1/3rd of the interventricular septum

Question 20

Most hearts are ______ dominant

Answer 20

Right

Question 21

Most hearts are right dominant.
What does this mean?

Answer 21

The posterior interventricular artery is supplied by the right coronary artery. this means that the R and the L coronary artery share equal supply to the heart

Question 22

about _____% of people are left dominant.

Answer 22

15

Question 23

if people are left dominant what does it mean?

Answer 23

the posterior interventricular artery is a branch of the circumflex branch

Question 24

about _____% of people are co-dominant.

Answer 24

18

Question 25

18% of people are co-dominant.
What does this mean?

Answer 25

Both the left and right coronary arteries gives branches to course in or near to the posterior interventricular groove